Servo for XRP not working properly

THe servo for one of our XRP has started working erratically. We think it is not a code issue but are not sure how to test the servo. Also curious if we should open it up and take a look but can’t find diagrams of what is inside. Thank you.

Can you swap it with another unit by chance to test? What is it doing? Sometimes they act wonky when the batteries get low (is your plugged in?)

No, opening them up usually results in more troubles :-/ Is it less than 30 days old?

We do sell them (so should a local hobby store like hobbytown, also amazon)