Windshield Wipers intermittently touch each other
 

I have noticed, windshield wipers when working touching/overlapping occasionally. My guess is one of the motor frequency got changed.

Does anyone experienced this?

Any suggestions to fix this?

Thanks in advance

Car:

BMW X5 E53 3.0i 2002 Euro model.

I would check the wiper arm nuts first before worrying about the frequency. Sometimes the nuts get loose and walk themselves up enough to where the wipers get off their current spline position and rotate slightly. This causes them to be off time with the other wiper. Give them a check. It's happened to me before on other BMW's.