I have a 1997 Seville STS which has been a great car and nearly trouble free for years. Until now... While driving at night, the headlights and dashlights will occasionally (and quite unexpectedly) go out. Manually pulling out the headlight control knob will bring the headlights back on but the dash remains dark. Pulling off the road and turning the key off/on will often restore everything back to normal operation. But obviously this is a rather "exciting" and dangerous condition. The twilight sentinel switch is my primary suspect. However, I would appreciate hearing from anyone who has resolved a similar problem or has a suggestion. Thanks in advance!