I have had my system for 2+ years now and just had this occur. Came in and upon punching in the disarm code, keypad froze and then went black. Of course the alarm went off and I had NO WAY to disarm it as my wife has the only fob. Hard to believe there isn't a way to turn it off using the app on your cellphone. Put new batteries in after about 5 minutes and it worked.
Am I missing something, is there a way to disarm using the app? If not, why?