Been playing on my laney for 2 hours and all of sudden heard this horrid POP like a really low pitch thud, so i thought meh, kept playing and it happened again and again and again and again until it was going pop pop pop pop pop pop

I've just re-tubed it and its been fine for weeks? suggestions?
Ibanez PGM301 signed by Paul Gilbert
Ibanez PGM 500
Ibanez Fireman custom
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Orange PPC212 2X12
laney... big surprise
05' G&L S-500
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Peavey Classic 30
Maxon OD808