13 nytro hand warmer issues....

I thought prior to 2011 had the issues but mine are having issues also..they did work great when working
my hand warmers are not working. started with 1 last year and then the thumb so only have one still working.
I did add a riser and steering relocate kit so maybe that's part of the issue but I need to fix this before snow falls as I was miserable riding last year with cold hands.

Where to start and what is the easiet replacement or fix?
 
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