Battery door thread

Hello, I am concerned about the plastic thread on the left pedal battery door of my Garmin Vector 3
The plastic thread appears to be slowly stripping, and it is getting noticeably tougher to screw the battery door on; the yellow O-Ring now gets squished up when I tighten the door.
I've had these pedals for over a year now, and they've worked flawlessly - although i've just today had a ride with drop-outs and power spikes (, the first time I've had this.
Just replaced the battery doors and internals with the new kit (not needed it previously), so we'll see if that helps, but my concern with the thread remains. 
What should I do here?
Thanks for any help