Heās been having these episodes for a few years now, I have a video but I think itās too long to upload on here. Iāve took him to the vets a few times about it the first time the vet said just leave it because it only happens once every month. Most recently he had an episode that lasted a lot longer than usual, in the end the vet recommended BOAS because he thought the episodes were due to a lack of oxygen. Since then he had one which lasted about a minute and then today he had one which lasted about ten minutes like how they did before the surgery. Does anybody have any idea what could be causing this?