Light flickering

Anyone else ever have this happen? I have the olight S10r baton 2. Went to use it today and as I went to change brightness modes it just stayed the same low output. But when it changed to mid and high it was in low but flickering. What could this be from?

Update; everything seems to be tight. Guess I should've said I've only had it since December 28th. So it's not even 2 months old. It does now go into the mid setting, but going to high it just stays on low and flickers still.

All better! took the tail cap apart, wiped it all down, put it back together and now works fine.