So anyways I got this Fender BXR60 that I got maybe 2 years ago (with 5 year warranty). Nowadays when I go to play a bit, the amp sounds good when I turn it on, but seems to go dead after a few minutes of playing. I have no idea what's wrong with it. I had my bass ( a Hartke AK-5 ) checked out recently and that's fine, so I guess it's the amp...anyone else ever run into a problem like this? I'm basically a complete newbie, so maybe someone could point me in the right direction as far as what to do next. I'm kinda lost. Thanks in advance.