Have a LG LRE3012SB electric range, the start and clock buttons no longer work properly. They function very intermittently. Sometimes they work right away, sometimes you have play with them for 5 minutes, sometimes they just never function. I did a reset per LG tech; unplug range and hold start for 30 sec. It seemed to fix the issue for a couple weeks, but then started acting up again. Is this a common issue on these? Is there anything i can check that might be an easy fix. Or am I looking a Keypad or possibly PCB replacement ( neither of which are available anymore)?