I had this problem with the SVX. I just had to take apart the mechanism, clean it, and regrease it. Then again the SVX has a crazy complicated cam mechanism in there because the wipers have an extra sweep mode to allow them to park off the glass down below the hood, and it was that mechanism that had gotten sloppy and allowed the wipers to sweep out of range.
I don't think the WRX mechanism is that complicated, but it wouldn't hurt to see if there's anything in there that could use a rebuild.
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