I have had a similar problem with my 2010 Sam. A little different in that it is most noticeable on the drive side down stroke and particularly when spinning when not climbing. I put it down to poor peddling technique until it got worse. After making sure it was not a crank issue I have determined that there is play between the hub body and cassette; radially, not laterally. For the first time ever I actually used a torque wrench to tighten the lock ring to the specified torque and that has stopped it for now. The cassette is 12-36 Shimano and hub is Deore, both from RBW.
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