My Vector 3S pedal drops out

My Vector 3S generally works fine.  But, with no apparent pattern, it will just stop reporting, in the middle of a ride (batteries are fine).  If I stop, tap the pedal, and power cycle my Garmin 520 head unit, it sometimes will re-commence working, and sometimes it won't  

Perhaps related, the battery cover won't screw down tightly; if I try, it just strips the end of the threads.

Can I send my pedal in to be fixed?