hey ultimate guitar,
i've had my Spider III 75W for only a couple months now, and it has had this problem for a while now. every time i'm playing, it randomly changes the tone, idk what it is doing, but i'll be playing on my set channel, and automatically, the sound just pops out of no where and my tone becomes louder and bassier. i thought i fixed this by resetting it to factory settings, but about a couple weeks after i did that, its back to this again.
any ideas on whats going on?
Its a spider they are not know for their long term reliability. If its still under warranty see if they will fix it or replace it.