Vizio e500i-b1 turns off

I have a Vizio e500i-b1. The issue is that after watching it for about an hour, the screen freezes for a few seconds while the audio continues, and then it powers off all together. It is a normal power off as if I were to do it manually. I can then power it back on with the remote. I took the back off and can’t see anything visibly wrong with the main board or power board. My assumption is that there is an issue with the power board, but I don’t want to waste my money on one and be wrong (not to mention they’re scarce).

I’ve cycled the power, took the batteries out of the remote, and checked the timer settings.

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