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Main digital board fault. Contact any service technician to get it repaired. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
You should try tristatemodule.com it sounds like its your main board thats shorting out give them a call and they can give you a cheap price on a replacement and guide you through the repair over the phone.
Most of the Hotel sets use a different remote to enter the hidden menus--the system that set uses was likely on channel 81 and where it was used they needed it to come on at a specific time----going to get that specific service remote and info on how to change settings---this is the issue with buying these commercial sets.
Zenith is part of LG but different phone numbers etc
I have seen problems similar to yours in the past. Several causes can
make the channels change by themselves. Some corrosion on the main
board near the channel up/down switches for one. The next common cause
is that the EPROM may be failing or a fault with the main control
processor. A good test to see if the EPROM is having a problem is to
program in all the channels off the cable and then unplug the TV over
night and then plug back in the see if any channels are missing.