I bought a Kona Cinder Cone a couple of months back and have been playing around with it as I like to get the bike setup perfectly. I've noticed though, that if I spin up the rear wheel, then let the bike freewheel, the cassette wobbles or moves slightly, almost like it's loose.
Is something loose? or damaged? It also every so often makes a slipping noise (during each revolution), although this is temperamental. I took the rear off and inspected it, but all seemed fine. I would dismantle the rear hub, but don't yet have the tools at my new place. Any ideas what it could be, and should I stop riding until I find out to stop any further damage?