Error code advice please

Had the 2012 Fabia Mk2 with a intermittent engine light problem, OBDii scanner states: P0441 Evaporation emission system incorrect purge flow. This only occurs occasionally, the error came on once in Feb 26, then again June 26 and now the light came on again yesterday. Could this be the N80 purge valve sticking intermittently or another issue, the randomness of it does not point to a major problem and I'm not happy to give it to a garage to charge me stupid money to investigate.

Is it worth changing the purge valve or should I be looking towards something else?

Thanks

Ned