Ok folks, here's the deal. I just got me a 2nd hand GK 2000rb for £500 from my former guitar teacher. Sounds great, seemed like a good deal. Now apparently, these amps are said to be really unreliable. This did not occur to me at the time, since I am an idiot. So, what, if anything , is unreliable about the GK 2000rb ? Should I just get rid of it ?