Ability to restart a device (keypad)

Ability to restart a device, or better yet have function to randomly restart one device (keypad) at a time within the selected hour range. I have three keypads, one at each exterior door. Initially all three keypads sound/chime was synchronized (and yes, I read about these chime out of sync other having, I was like what’s wrong with these people and their keypad? Mine work perfectly fine……BUT as time go by at least one of them was out of sync(way delayed). I really want to unplug power to hard reboot these keypads , but it’s being a keypad with built in battery so that won’t be possible at all. I just really wish there is a restart/reboot function available for each keypad. I have a feeling restart/reboot it would solve the out of sync issue (am I sound like a pc user?lol). Some other brand (w) has that function on most of their cam.