2000 Subaru Outback Shutting off

I have a newly purchased 2000 subaru outback automatic. I just busted my back doing new front CV Axels, Inner/Outer tie rods with boots and front tires with alignment.
The other day when coming to a stop at a intersection she shut off rather abruptly. She started up again right away but its happened a few times. The general concensus is that this typically is an indication of an electrical problem but I have also heard transmission fluid issues and perhaps an air sensor. Any thoughts would be appreciated, I plan to do my transmission fluid and see if that does the trick.

just wondering…did the “shutting off” problem resolve itself after you worked on the transmission fluid…?