Can't disable screen saver anymore, and screensaver causes panic attacks in dementia patient.

The TV programming "falls asleep" every 5 hours now.  I NEED TO DISABLE THE SCREENSAVER PERMANENTLY. Not for 5 hours, FOREVER.  I live with an Alzheimer's patient and this "feature" is causing panic attacks — which causes hyperventilating/heart issues that COULD LITERALLY KILL HER. Even if I use a smartplug to restart the x1 box every 4 hours, it falls asleep an hour later. It was working fine for the past year, but an update apparently (?) removed the option to disable the screensaver.