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Hello, I have an issue that suddenly cropped up with zero changes to config on the Unraid 6.9.2 server and Windows 10 clients, but now results in SMB file transfers starting off fast, then drops off a cliff to 0 and eventually fails. I am remotely connecting to my server. The host for the server and my location is both on the same gigabit fiber ISP, and there had been no issues noticed in the last at least 6 months of using with many large file transfers per day. Previously, downloads from the server at >90MB/s, uploads to the server at >40MB/s (slower but stable, I never configured anything to throttle it, but it was always stable so I didn't think twice about it). Now the downloads are the same, but uploads peak at >90MB/s, but is unstable and risks dropping to 0 and failing. Downloads never seem to fail. I have tested this on both my Windows 10 desktop and my laptop via ethernet and wifi, same result. Nothing would have changed on the routers at both locations, as I am in control on both ends. Alternatively, I have tried using my OpenVPN docker for SMB file transfers, and that has been rock steady, but significantly slower than Wireguard (about 30% the peak speed of Wireguard). Any advice?

So I've been having an issue that with my novice experience, I don't know where to turn. My Unraid box is remote to me hosted at a buddy's place, so I've been transferring files to and from the server via SMB over Wireguard. Started using Wireguard with Unraid 6.8, but suddenly started having issues and still having issues into 6.9. I've been having SMB file transfer issues where the speed will suddenly drop to 0 and eventually drops out completely. This appears to only happen when I upload to the server, and not while downloading from the server. I have tried file transfers over OpenVPN and have not experienced the same issues. Both my location and the remote location has gigabit fiber, so the speed difference between Wireguard and OpenVPN is quite significant. Running iperf3 over OpenVPN, I am getting speeds of around 200-300 mbps downloading from the server and 300-400 mbps uploading to the server. Running iperf3 over Wireguard, I am getting speeds of around 500-700 mbps downloading and uploading to and from the server. File transfer speeds on Windows 10 can start off at about 60 MB/s up to around 90 MB/s, but will suddenly tumble down to around 2MB/s, and then eventually just ~200KB/s to 0. I don't exactly know what is causing these SMB dropouts, or what had changed. I do know that I have not changed the Wireguard config, and the transfers were rock solid before, but is no longer. There are no SMB dropouts with OpenVPN. I've also tried reinstalling Wireguard server from Unraid and reinstalling the Wireguard client from my Windows 10 tower and laptop, but same issues persist. I've also tried transfers to shares that bypasses the cache drive, same issues.