I'm not guaranteeing that this will fix your problem, but I ran into a similar issue where the right turn signal would malfunction periodically, but only during humid weather. Where I live, this only occurs during certain times of the year, and by "humid", I mean, "weather that the rest of the United States has for most of the year".
I removed and disassembled the turn signal switch (be careful not to lose anything), cleaned all the contacts, and have been functioning properly for about a year. It's worth a try.
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Chris Herbst
Phoenix, AZ
2005 S80 2.5 53k
1992 940 (sold!) 170k
2012 Subaru Forester 2k
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