I’m not sure if this is of any help, but I had the same issue with Wake on LAN enabled. This was a while ago with an Asus motherboard.
If you don’t need WoL, disable it and it should fix it if your MB is affected.
But if you do need WoL, look at https://wiki.archlinux.org/title/Wake-on-LAN.
The section 5.2.2 Fix by kernel quirks was what fixed it for me.





Some months ago, I had UTD issues with Element X too. My hs has been up for some years, and the devs claimed they had done a lot to fix UTDs.
I was about to bring the server down, but as a last resort decided to log out all but one Element web session which was able to decrypt the messages and try resetting the key backup. Haven’t had any UTD issues since then.
Maybe worth a try.