Hi Thomas,
on one hand let me ask a few questions (below) as the report as-is can't really 
be acted on.
on the other hand - even then - this is a topic that does not sound like an 
Ubuntu specific problem or fix and therefore more likely will be successful if 
deiscussed upstream (https://github.com/virt-manager/virt-manager/issues). If 
you happen to file a case there please let us know so that we can track it from 
here. If there is a fix coming out of it this will help to fix/backport it to 
Ubuntu afterwards.

Ok, after that being said let me start with the obvious questions.
1. You use v3.2 right now, have you seen the same with former (e.g. 2.2.1 in 
Focal) or later (4.0 in Jammy) versions as well?
2. What exactly is "moderate load" in your case?
3. could you come up with a step by step reproduction based on clean systems?
   For example take two Ubuntu VMs version X, sized with that many CPU/Mem
   connected to the same virtual network via Y. Then run a KVM guest on one
   like Z, connect to it from the other system. Then run the net-workload X on
   the host to simulate the load.
4. what error messages do you get exactly? Are they always the same?

** Changed in: virt-manager (Ubuntu)
       Status: New => Incomplete

** Tags added: need-upstream-report

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https://bugs.launchpad.net/bugs/1965676

Title:
  virt-manager looses connection to virtualization hosts at moderate
  loads

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