I have a 2007 214e that I use very heavily. I've had a number of problems consistently for 4 years or so with the signal cutting out during performances. I always use a new battery and have tried brand new cables and I'll still be playing and the sound cuts out and comes back completely randomly. Overall I feel like I have to absolutely hack at the guitar to get any presence out of it and really I've never been happy with the sound at all. Also for the past year or so I've lost the high end and can't get much treble volume at all even when I turn that knob up. If I'm playing a solo you can't hear anything on the high e and it'll be super loud when I get to the bass notes.
I've never had the time or money to get it properly looked at and a few weak guitar center setups have revealed nothing. Any help would be greatly appreciated. Thanks!