My swashplate started doing the same thing, the bearing would pop out after a hard landing and then just when it felt like it. I took it off, cleaned it up, and VERY carefully used a few small dabs of 2 part plastic welder to glue the bearing in the lower and put 4 little dabs above it to hold it in place. Just be very careful not to get any on parts that move. Mine's been fine since the fix and hasn't come loose again even after some real hard landings. Hope it helps.
Chris