GAC2500 Screen only allows me to touch it for like 3-5 seconds and reset button won't work too


Hello, we have this unit GAC2500. The screen becomes untouchable after 3-5 seconds. Afterwards, it can’t be touched anymore. It was once connected with the GVC3202, now we are trying to just use the GAC2500. I was wondering if the GVC3202 need to be connected to reconfigure GAC3202. Thanks for your help.