system
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I don’t use “AM”, but I thought about checking something anyway.
You say this is related to Avast Firewall. Although you mentioned that the problem started with the latest version of AIS (and still works correctly with previous versions), please try this at least to test it and maybe narrow down the problem.
Usually, Avast FW works together with Windows FW, both “on”. Can you completely disable Windows FW and reboot, so to test the new situation/performance?