Happened to my wiper only once for a very brief period (30 seconds) a year ago. The wiper did not change speed when I turn the control, but I instantly switched it back and forth a couple times, all went back to normal, the wiper has been used many times since then without any problem. Rear wiper is also fine with no fluid leak at all.
No heat and A/C problem in 15.5 months.
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