I havn't had this amp for too long. Maybe for about  5 months. It's a great amp and it has been working well for me. I used to practice everyday and it was fine. Recently, I played my guitar and the sound went away and came back when I moved the wires. I havn't played since then and when I tried today, no sound came out at all when I strummed and put it on high volume and moved the wires around. The only sound that came out was when I turned it off and it makes a little boom sound. Can anyone please help? I already blew out 3 other amps in less than a year and hopefully, this one is fixable. Thanks!

i'm moving the extension chord that is connected to the electric guitar to the amp. i habe a line 6 spider ll 15.