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The wiper linkage wears out over time, so that is a possibility. And not one of the easier 240 DIY fixes -- but lube might help. This mioght make more noise than the wipers generally do.
The only other thing that comes to mind is that, within the harness's plug for the motor, a connection could be failing, and the increased resistance at the failing point would causes heat and that heat would cause even more resistance (and some more damage to the connection). Once the wire cools down, you start over. If that is the problem, the plastic part of the plug might be showing some heat damage.
Be careful.
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jds
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