Hey flicky, I’m probably not going to be much help but I seen you didn’t have a reply!
I’m 8 months post op and I’ve not had this – I only think I felt air moving around within the first few days to a week at most so not that much. But as far as I know trapped air in the pocket usually should have dissolved after the first few weeks. If it keeps happening or there’s other changes I would maybe think about going for a check up to put your mind at ease. x