My only experience with a wiper problem was actually part of a recall. The main, large nut on the inside of the front compartment that holds the wipers in place had worked loose which was what the recall was for.
I heard their fix was to simply put locktite on the thread and re-tighten the nut so I did it myself.
If your main wiper shaft through the front area appears loose then you might look back behind the bulkhead to see if the large nut has worked loose, better check both sides while you're at it. Both of ours were loose but only the passenger's side wasn't making contact with the window.
good luck
__________________
|