TBH I've never had an issue with other extending zooms, but with the 150-600mm you could actually hear and feel the suction it created
I was going to send it back to Tamron for a free clean (I think it was almost an admission of the problem) but I got a decent trade in price so never bothered. It was especially odd as I thought that lens was supposed to be weather sealed, but if you saw how much dust it pulled in it didn't fill you with confidence. For what it's worth though it never affected image quality.