I'm having the same issue. I'll pull logs and attach in a bit, but wanted to reply so I track this post.
Ever since I upgraded, my server has been acting weird. It has crashed multiple times, freezes, services die etc. I just rebooted and while all the containers are up, the Unraid webGUI is giving a 502 bad gateway.
It's very very unlikely to be a hardware issue. I'm using relatively new hardware (it's a Dell Optiplex Micro, around 2 years old,), and everything was working flawlessly with multiple months of uptime.. till I installed this update. After that, issues galore. I suppose it's possible that something in the machine broke, but the simpler explanation is that something in the update isn't working right. I'm seeing more people post about similar issues as well.
Kinda disappointed with Unraid on this. I had moved from a self-administered Proxmox server thinking that Unraid would be easier.. but this update has reduced my confidence in Unraid. My Proxmox server ran for 5+ years, with many, many point upgrades and multiple major upgrades, and never once had an issue.
I hope this is something minor and easily fixed.