I have a rattling noise while clothes are drying

I have a rattling noise while clothes are drying

while the clothes are drying i have a rattling noise like something got in the load, like a downy ball, but nothing in dryer. noise is random, with no rythym like is is rolling around in dryer but is similar in sound. it does not affect drying...yet

ANSWERS:

@beth1915 does the rattle occurs only when you have a load in or will it rattle when the dryer runs empty. This could be the roller wheels that the bin rolls on . There could be a bearing that stops occasionally and has flat spotted the wheel or the bearing itself may be in its way out . Hope this helps