1. You will need to check the units instruction manual.
This sounds like the LCD TV is in the "timer" mode that is the tv is set for 120, 90, 30 minutes and then turns itself off.
2. It also maybe a circuit built into the TV to protect the electronic components and will shut down the unit when it senses a heat or voltage change ( this can be a manufacturing defect) call the manufacturer and see if this is a recall. Some time the manufacturer will replace the unit even if it is a gift from the company you work for.
The unit has already been purchased and has full warranty status.
Hope this helps.
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