wobbly router

Anyone know what can cause a router collet to become off centred I have a new dewalt .5 " and when running there is a lot of vibration and as it slows down you can see the bits wobble from side to side. Its never been knocked or banged.
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Sounds like the bottom bearings ball dividers (race) may be broken allowing the balls to shift inside the bearing, if so...DO NOT USE, can you move the shaft sideways in any direction while rotating it by hand at any time? can you feel any roughness when turning it by hand? does it rotate freely backwards or feel like some resistance? If you answer yes to any of the above being new return it to DeWalt service, do not run it like that as the balls could seize & come to an abrupt stop causing much more damage.
Is there a chance that the shaft of your router bit is bent? with 1/2" shank it is unlikely but not impossible either.
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Jon Down
http://www.stores.ebay.com/jdpowertoolcanada
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