Thank you for writing back to us, Ian.
Could you let us know whether you're using any other antivirus software on your devices other than AVG?
Also, if you could reinstall AVG Antivirus on one of your devices, temporarily disable it's individual components one by one, we may be able to narrow down which AVG shield/component is causing the issue.
Refer to this article for detailed instructions to temporarily disable the individual components of AVG Antivirus.
Keep us updated.
Is AVG gonna supported this ?
cause I don't see AVG listed in this list