Tandem t slim pump users

Tandem users:
Noticed an air bubble in the leur-lock section of the tubing, (a few different times now). It can sometimes move around if tube is moved, or stay still if tube is moved.

One time I think it was from the leur lock section coming ’ loose’ on me and air got in the leur lock …so learned you can ‘re-tighten’ leur lock section (when disconnected from your site) to see if the connection was loose, then re-prime (while disconnected) to get air out?

Tandem also told me that if the bubble doesn’t move after priming it, (which noticed today) the bubble could be on the ‘outer’ portion of leur lock tubing inside? Has anyone heard of this? They said this shouldn’t cause insulin delivery issues?