Haven't had the problem myself, but I have heard of it. Then again, I didn't keep my stock HU long enough for it to see cold weather. I recommend a new HU. You can get one that is light-years better than stock for well under $200. If you do, be sure to bypass the 'premium' amp, if you have the 'premium' sound package, or you'll loose out on at least half the benefit.
1999 Contour SE Sport MTX75 T-Red/Grey
Audio: Pioneer DEH-7400MP (MP3 CD), Pioneer TS-A6857 front & rear, PPI PCX-250, Infinity Perfect 10.1
Other: cup holders, cargo net, Blizzaks, Potenza RE950s
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