The grip switches are pretty durable esp. the turns signals that are just "momentary-contact" switches. Not my first guess for the location of the problem. But they do have to take a lot of abuse and bad weather. I spray WD-40 into them regularly for the several benefits from spraying it. WD-40 and a bunch of pushes of the switch might fix your problem. I don't think WD-40 harms anything, so spray away.
Rebuilding a grip switch at home is tricky if you have to deal with little springs and other parts that fly across the room. But might be fun on a cold winter night.
A very happy day for me when I installed the Kissan Signal Minder. I was breaking my thumbs turning the signals on and esp. turning them off. Can't say much nice about certain of their business practices, but their Signal Minder works nicely. Stock set-up real PIA.
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