Interesting, I have only heard of this happening a few times in the last 8.5 years. Root cause was never determined but one customer had put a sign up in the area of the Omega device that the "Area is being monitored by security cameras" and they never saw the problem again. We speculate that someone had a device or one of those little remote controls and was walking around changing the screens.
I have not seen a PS150 get to the point of hardware failure where this happens infrequently or frequently. It is triggered, as far as I know by some IR signal it gets from something.
Alternatively, you could upgrade the PS150 to a PS200 which does not have this problem.
How about a sign saying "Area 51, Area is being monitored by security aliens" ?
Not a major problem, just curious if others had experienced it and if there was a known root cause.