Sensors Disconnecting

I am having random sensors disconnect; typically the ones that disconnect are no more than 25 ft from base station and no brick or solid lead obstructions.  So far all I can do is open the door and window and then it connects again. Using the default battery in all sensors that came with unit.  Don't even get me started on cameras disconnecting and not really supporting 1080p properly or WPA2/WPA3 mixed encryption :-(