Hi guys!

So my vypyr vip 3 seems to be acting up. I had it for about 2 years now and it has just recently been doing this weird thing.
When I have the settings on for heavy metal like metal legends presets and strumming multiple strings on the guitar, or even some times just one string, the sound will stutter like it's lacking juice. It only happens for distortion presets. Does anybody know what could be wrong, is this something common for the vypyr vip3? The other thing is that I have always felt like the amp lacks warmth in it's overall sound, anybody else experienced this?

These are my specs, not very hi-end

vypyr vip 3
Planet waves neutric cable