With only 7500 miles on 'er it's safe to assume the chain and sprockets are in good shape so yeah, as others said a maladjusted chain is probably the culprit. Checking for correct tension is easy. Make sure the bike is sitting in neutral, then sit on the bike and reach down to check how much slack there is on the chain. A properly adjusted chain should have +/- 1" of free play somewhere mid point between the sprockets.
