On vehicles with intermittent windshield wipers, the wiper motor circuit board may fail and cause the wipers to stop working at times. Replacing the circuit board should resolve the issue. Some vehicles were recalled for this problem and some were not. You will need to check with your local dealer to find out if a specific vehicle was included.Google+
Car Problem Reports
Chevrolet Blazer Failed Wiper Motor Circuit Board May Cause Intermittent Wipers to Stop Working
Chevrolet Blazer Problem
Average Mileage: 78,625 mi (14,500 mi - 150,000 mi)
Visitor, 1998 Chevrolet Blazer, 70,000 mi
Wipers would not park at bottom. Also, sporadic issues with wipers starting and stopping. Bought a new control board/module from local auto parts store and installed in less than 30 minutes. No problems since. Easy DIY job.
Visitor, 1998 Chevrolet Blazer, 14,500 mi
will look into circuit board
Visitor, 1996 Chevrolet Blazer, 80,000 mi
windshield wipers worked off and on , it was a recalled wiper motor and replaced free. no more problems
Visitor, 1998 Chevrolet Blazer, 150,000 mi
Front Wipers work when car cold in morning for about 10 minutes or single wipes for about 20 minutes.
Once warm, nothing. Rear always seem to work.
Will try the thread that points to a cold solder or solder failure.