Amp V4 issue when it goes into Standby

I have a few boards installed around the house behind some old intercom speaker grills. The volume is controlled through a rotary encoder and other controls are t the various resistor combinations for key presses.

However, over the last two weeks, I have started to have issues. It seems that when the unit goes into standby mode that it no longer responds to the key presses or volume control.

I have to click the reset button and cycle it back to wifi and then it works again.

The same issue is preventing the other speakers in the group from coming on also some of the time.

Any hints or tips to deal with this?

I think I may have solved it. I had been using DHCP for assigning the ipadress for device. I switched over to stati addresses and it seems to be working for the past few days.