They only thing I've experienced that seems similar was when the throttle body failed prematurely. It wouldn't go past 1K RPM. But it wasn't intermittent like in your situation.
Why not take it to the shop if its happened multiple times?
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GT3 Recaro Seats - Boxster Red
GT3 Aero / Carrera 18" 5 spoke / Potenza RE-11
Fabspeed Headers & Noise Maker
BORN: March 2000 - FINLAND
IMS#1 REPLACED: April 2010 - NEW JERSEY -- LNE DUAL ROW
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