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These great, I think 1s delay on not a problem.

If boot to safe mode, same ?

Any progress in your build ? I make some modify to mount the fan on plastic mount outside, as result, the fan now more close to the blackplane. The aim were make more air pressure to push more air out ( pls note I reverse the airflow direction from rear to front ) , btw the test got positive result. So I have order 3 Arctic P12 Max to replace Arctic F12, the noise level have double, but I can adjust its speed by PWM, I would expect 50%-60% of P12 Max will be same as F12 (100%), after that I can cool more if I accept more noise. P12 Max really cheap.

USB power not a good source to control SSR on/off, because it may on / off during server booting / initial. Current sensing (normal open) switch more suitable for this case, but you need found a device have enough switching capability. Pls also confirm does EMC KTN-STL3 will power on once AC input have power. Those switch no need external power, only need main wire pass-through it. !! Below are example only !!. https://a.co/d/8eiFl3s

Provide network settings and docker page screen dump for ref.

Strange, all my build were latest, no problem.

Umm ..... I don't think Wing 4 will be such large different ( too good to be true ), I browse different YT review also not found such outcome. Below YT test said PPC3000 should be around 134.1 CFM and 5.664 mm H₂O. Pressure really importance, airflow seriously block in a rack when insert all harddisk, we need strong pressure to push out air. ( That's also why I point out the gap between fan and fan plate. ) Below YT have review Lian Li P28 ( have PPC3000 ) , it seems quite good for restricted airflow situation, cheaper a lot (2/3 price) and have 3 speed range too. I really have some interest !!! https://www.youtube.com/embed/AeOvOeTbCrA?si=Jdo4OGZTbX36Yc7d&start=405 There have three side for housing contact with fan, all three side with 3M tape ? This seems some difficult . For me, I prefer drill mount hole in fan plate if haven't.

Update mobo / CPU usually plug and play, I perform change several time just need modify some temperature or fan sensor setting.

Unraid Connect have public update in few min. ago, to be honest no surprise because not much different as previous flow. 😉

You can backup the flash before each update, if you want go back then restore it. There are no big change in current v6 Unraid which will affect your requirement. For Windows SMB access, it may prompt input username / password even the share is public, but input something would be fine. For Player SMB access ( I set logon need ), player will remember in initial SMB shortcut setup, I don't need input again.

Understand, I have many times diak failure in 1.5T / 3T Seagate or WD disk which longtime ago, but just 2 or 3 times in next 8yrs.

You mean they are not actually failure, but generate abnormal sound ? I use lot of Toshiba 6TB disk, but next 8TB - 18TB were WD, because they are cheapest.

I don't agree problem cause by disk pool, I use several btrfs/zfs pool and they work really well even in heavy load. But I don't like cache ( mover ). I run docker in ram disk ( small total docker size ), this not because the storage can't handle it, just because spinner disk ( noise and heat ) or SSD ( endurance ) concern.

Sound like you are not pass through NVMe to VM, for better performance, you should try pass through NVMe, dedicated for single VM. Toshiba, which model ?

That's fine, we can assume memory / its setting fine.

For robust network setup, especial Unraid / multiple ethernet server, the best way was never config. same subnet to multiple ethernet interface and use VLAN to seperate them. After that you will avoid any starnge issue.

May be best in 4 passed. I will simple clock down to 2400MT/s, this is a quick way to remove memory problem then 2 passed and going further troubleshoot, you can set back to auto or 3200MT/s later if you confirm problem not come from memory. Not suggest manual set the voltage. I never found a mobo will use 3200MT/s but config in 1.2v instead standard 1.35v.

I think so, I test that too. I replace those fan with some cheap PWM fan, currently have over temp issue,. but my rack not 7x24. ( FAN max in 1200rpm ) I will prefer replacement in around 3000rpm fan, Noctua or SILENT WINGS PRO 4 should be my first choice. One of problem you need to be address, those fan thinner then bundle fan, so if fan mount to the housing, then a big gap with exist between the fan and fan plate, you may need mount the fan to the plate for better performance. https://www.bequiet.com/en/casefans/3705 ( it have speed switch, I think it would have large speed rang adjustment )

I enlarge the photo, confirm it is 3A, pls don't direct plug to mobo. It is possible if backplane / fan controller support connect to mobo fan header to take control. For external or 3rd party fan controller, this usually won't support high power fan. Need consider air flow / pressure will drop a lot even Noctua Industrial type.

AMD 3000G / A320 chipsert may not support ECC memory. Below table ( not A320 ) also indicate different CPU with different chipset have different ECC support. I believe motherboard problem ( or other unknown reason ) more then memory. Could you try copy some file to /tmp ( ram disk ) then monitor does file content / hash will change with time ? There also not sense if it is memory problem - If memory problem, system will crash, not just file corrupt. - If array disk file corrupt, then it also expect system file / USB file corrupt too, as result system will also crash. I have a strange experience, a new build platform, all test was great and running well, but when I insert a NVMe, file copy to it will corrupt immediate, no different with different NVMe ( no any error log / even PCIe error and no problem on SATA disk ). But problem suddenly gone after few days troubleshoot. Finally, I RMA this mobo and problem never happen again.

Does use Unraid build-in memtest ? You must solid pass memtest 1st. I check your diagnostic, the memory config have problem. no reason memory stick would run at 3200MT/s but just 1.2v. ( Pls tuning BIOS memory setting or simple disable XMP, so it will clock down the memory ) Configured Memory Speed: 3200 MT/s Minimum Voltage: 1.2 V Maximum Voltage: 1.2 V Configured Voltage: 1.2 V This not a problem.

That depends on how robust of those memtest program to make test, different software have different test algorithms. Unraid have update the build-in memtest86+ ver. since 6.12.5, in old ver., it also unreliable and I always use 3rd party memtest program. Anyway, all depends on which test program use, it doesn't relate come from BIOS, Unraid or whatever. https://github.com/memtest86plus/memtest86plus?tab=readme-ov-file#memory-testing-philosophy ( your BIOS memtest were come from PassMark software, they are compititor )

This normal.

If memory test fine, I believe it is other issue cause corrupt problem. As mention, if static file just seat at storage, no much reason it will corrupt. Could you change it to read only and monitor its content will be change ? Pls ensure no one have copy/backup it in same destinations, and no user share to disk share or vise reverse.

You need relocate your main machine and NAS in same area and connect both in physical wire, then access Internet by WiFi or Powerline or whatever.