Client PC's not staying connected to admin panel

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I have recently been having an issue with 4-5 PC's that continually disconnect from the admin panel, when I restart the PC's they connect again, but then randomly disconnect and I am not sure why, I have 20+ PCs and all of the others work perfectly fine, can anybody help me troubleshoot this?

The admin panel is running on a Server 2012 R2 Essentials which is the domain controller.

Thanks for the help!

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Anybody?

[spi]

Yes, have the same issue over 2 or 3 years, just restart the avast service on the client no need to restart the PC/workstation