My 8 year old GX500 was doing the same thing. 'Sticky' buttons. Every function worked perfectly when using the remote. Anyway, I upgraded to the Genesis 3.0 mainly because of simplicity. I found a new one on eBay for cheap. Got it installed with a wire harness plug adapter from Concertone, which was a plug and play install. Everything went great and now have TV hooked up via HDMI and optical audio cable. Also the 3.0 has a USB port and SD card slot, plus a front audio jack and BlueTooth. So far very happy as everything is working like it's supposed to.
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2006 Lexington 283 GTS
1998 Saturn SL2 toad