For years had the same clicking issue with NXR. I spoke to NXR's technician Jose and he advised to replace the burner base which I did and it solved the problem. This is where you order it:
https://shopnxr.com/products/outer-burner-base
The new base diameter is slightly smaller and it fits perfectly while the old base had you had to play with to fit. I recommend that you order one to try (it's $55 incl shipping) and see if it helps.
One would argue that they should replace these bases for free but I didn't want to fight.
Q
