I’ve the same issue with my Air terminal. We use that device in our taxi and suddenly it broke today at 8:45 am. This %#*@ thing never touched the floor or anything else and it’s always charged. The device is out of warrenty since February 2021.
Support sad to me the same thing “we can’t do anything else. Please buy a new device”.
Were you be able to find out anything regarding electronics and reverse engineering?