Hi everyone, been lurking a while and now it looks like it's time for me to post. Has anyone had an experience where one or two buttons on a Polaris stopped working for no apparent reason? My Polaris is one I bought from SoundDoctorin in Montana many years ago, the membranes all work except in one place. On the sequencer strip, Stop responds but Play and Record don't; and also, the key which makes this problem a major headache, Lower Function doesn't respond. Has anyone had this happen before and do you have any suggested troubleshoots?

Thanks,
David