If it’s been a year+ since the shifter batteries have been swapped, definitely put in some fresh batteries. You don’t have to take it to a mechanic, they are user-serviceable batteries that can be swapped in a couple minutes. I swap mine out once a year whether they need it or not, it’s easy and cheap insurance.
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Problem resolved I think, the gold pins that touch the battery were a little too compressed in the right shifter. I’ve bent them up a little and it seems to have fixed the issue but time will tell.