when yo say shut off, can I assume you mean that the AC stops working even though still switched on (the air from vents not cold anymore). When this happens, and you pull over, leave car and AC running, and see if the compressor is still working/engaged.
You may find that it's not. Try turning AC off for 10 minutes (no need to stop engine, or discontinue journy) and turn AC back on, see of works. If it does, then you need to check if power supply to compressor next time the compressor stops with AC on.
Then can take diagnosis further................
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