Electrical Issue (I think) causes hard jolt and O/D Light Blink - then it all returns to normal... any ideas/help?

[starbai]

So. Here's a new one that popped up today that I'm stumped on. I'm driving to work this morning around 60mph out of no where I get this big lurch. Almost felt like the entire transmission just fell outta the car. O/D light starts flashing at me... Then it goes away and the car runs fine. Few more miles down the road does it again. Get onto local streets much slower pace doesn't seem to happen at all. The o/d light is not on and it's not throwing any codes

On my way home from work today it seems like if I provoke if by giving it some gas while already up to speed that's when it doesn't like it. I feel like it could be an electrical problem because the stereo completely shuts off and I see the voltage drop considerably from about 14.1 to 12.7 and come right back up as a few seconds later when the od blinking light goes away and it resumes driving just fine. I also checked the transmission fluid level and it seems perfectly full. Not low at all.

It's not shifting hard otherwise nor does it seem to be slipping at all. It does lurch, od light, voltage drop and then back to normal like nothing happened within a few seconds seemingly outta no where and then it's fine again. With no codes to go off of I genuinely have no idea where to start.

Theres a procedure here: https://www.youtube.com/watch?v=BqyUIN1EWvI that supposedly runs a test on the transmission and then returns a number of flashing lights to get a code. When I did this I got 11 or 12 blinks which if i understand correctly means everything is functioning as it should. can anyone correct me if i'm wrong?