If it’s not the rod or the fan it’s most likely the control board. I’d buy one from Amazon and plug it in. If it doesn’t solve your problem return it but I’m betting it will.
You can epoxy a T nut from inside the barrel channel also. Sling studs are 10/32 thread. I just finished another one this weekend. It’s pretty easy.
But any excuse to buy a new stock is always a good idea!