Peavey VYPYR VIP-1 amp stuck on headphones

I’ve had this amp for a while and about a year ago it stopped working. I’m positive the speaker isn’t blown or anything because it starting working for about 3 weeks but did the same thing again. It just seems like it’s always thinking something is plugged into the headphones jack because it works perfectly fine if I use that. Any ideas?usps tracking showbox speed test