I have an old Frigidaire dishwasher that came with the house when we bought it.

Not sure if it was doing the same as yours but it would just completely lose power in the middle of a cycle and then come back on (seconds, minutes later) with a PF error. Running it again, was usually fine.

Then it got to the point where it would always crap out at the beginning of the cycle.

There should be a button combo you can do to make it go through a test of all the cycles. That might help you isolate the issue. For me, it still crapped out at the beginning

Bought a main controller board that sits behind the door as it contains the main relays (I think) off eBay for really cheap. Picked up the seals and latches off an appliance repair site that has individual how-to videos for every part on the site. Replaced everything and it's been perfect since. $100 for everything.