Sounds to me like the compressor is not working as it should.
It will shut down if the ecu thinks it has run for too long.
The compressor can be rebuilt if you are handy with tools. Hex keys are all you need. There are rivets that need to be replaced by screws on reassembly.
There is a guy in Scotland UK who supplies a piston ring kit, but the cylinder bore must be undamaged as it is Teflon coated.
I can find his ebay address if you are interested.
Terry
80 109" 2.6 P ex Army GS, saved from the scrappie.
95 300tdi 130 Single cab tray.
2010 Guzzi 750
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