Did you try my workaround - https://forum.proxmox.com/threads/e1000-driver-hang.58284/post-390709 ?
On some intel cards you need to disable all offload options.
I was having this issue with the interface being reset all the time under heavy load.
Here is the error:
[Fri May 14 23:55:54 2021] ------------[ cut here ]------------
[Fri May 14 23:55:54 2021] NETDEV WATCHDOG: eth0 (e1000e): transmit queue 0 timed out
[Fri May 14 23:55:54 2021] WARNING...
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