My Yale CCTV DVR has been playing up recently (since I plugged it into the AVR), the monitor screen goes blank and the app won't connect. I will randomly hear the tamper alarm go off which normally happens when I unplug and plug back in. The weird thing is, when I turn my AVR off a minute later the alarm goes off and CCTV is back to normal. Does anyone understand what's going on? Or is this Yale dvr a piece of junk. The app is bad enough as it is.