Do you put anything on the windshield other than a cloth and water or windex. Some people wax the windows. If this is the case, stop. when the rain-x or wax wears down it will jump until you apply more or it wears completely off.

Also, I'd suggest changing wiper blades. I swapped to the newer Bosch with teflon coating and haven't had a problem in years except when it's time to change the blade or serious crud builds up on the rubber. And like it was mentioned above, I clean the blade with a towel and windex(amonia or acohol).

The new blades are worth a try for around $10

Good luck