hello everyone, I've had an ampeg vh-140c for a while just as a practice amp and lately the volume has been cutting out after a few minutes of playing. It is a solid state amp. If I crank the volume and play it it comes back for a while then will cut out again. Should I have it looked at or do you have any ideas of what I could check. I only paid maybe 150 bucks for it a while ago so would really rather not sink a lot of dollars into it. Any suggestions are greatly appreciated thanks!