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https://www.ifixit.com/Answers/View/153081/have+frontman+15g.is+power+switch+my+problem
SOLVED: have frontman 15g.is power switch my problem? - Fender Frontman 15r - iFixit
Its MOST likely a loose solder connection somewhere in the unit, maybe on the front panel jack, maybe on the volume pot. It could also be the output IC...
power switch