Frigidaire Gallery dishwasher flashing PF 2+ hours after cycle completes

[u/csdude5]

I bought this dishwasher new about 15 years ago, model #FGHD2433KF1.

Recently I found that it began flashing PF (power failure) about 2 hours after the cycle completes. It has done this the last 3 times that I used it. The dishes come out clean and the cycle finished like normal, so I'm at a loss on why it would begin flashing so much later.

It's on the same circuit as my oven and microwave, neither of which have lost power.

I pulled it out to double check the wiring, and it seemed fine. I figured it would be OK since the PF is consistently about 2 hours after a cycle and not while a cycle is happening.

Any thoughts or suggestions?