Thanks for the input. My independent mechanics agreed with your suggestion. However, they went one step further. They said that they've seen this problem several time before and taking apart the whole assembly, cleaning it and lubing it will fix the problem for the long term. That's what I had them do and it cost $1.75 for materials and 3 hours labor (ouch!). They also said that using the wiper when it's binding over time will harm the electric motor which is significantly more expensive to fix ($500.00 Cnd for the motor alone).