AC weirdness

[KeZu01]

More issues!
Last month the a/c compressor died on my xj, it wouldn't spin, with ac on or off, and was killing the engine bad. Had a shop replace the compressor and charge it.
Today the ac wasn't blowing cold so I looked under the hood. Alas, there the a/c compressor wheel was again randomly stopping while running. Just does it when a/c is running now, so maybe not the same issue?
What's going on, could something else wrong with my jeep be causing it to kill ac compressors? The belt is fresh and just about everything else there is new too.
The shop was out of town as I was on vacation, or I would just take it in to them to ask what's up.

Jeep is a 2001 xj, 4.0, aw4, 4x4.