Knock level went high

Power22b

Sunday Drivers
Driving the sti yesterday after not been driven all week and the knock warning light flashed on the dash. Looked at the hand commander and it registered 57knock normally it never goes past 12. Anyway drove the car after that and it didnt happen again. Any idea what could have caused it? p.s car is mapped for 95ron+octane booster.
 
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