Bit wobble with 60deg

Has any one experienced the end of the 60deg bit not being on center? I’ve found this problem to be intermitent with about a 1mm wobble at the end which I obseve when the bit is not in contact with the part. I’ve broken down and inspected the bit and collet for anything that would throw it out of balance such as dust but haven’t found any thing. Thinking bearing maybe but it being intermitent makes me think not. X-carve only a few months old. Any one else see this?