steps like this are an electrical or a mechanical problem. As you are also having problems with the Z, it's most likely that the step motor drivers are tuned wrong. If that's not the case, then your belts are not tight enough.
See:
http://wiki.ultimaker.com/Electronics_b ... or_drivers
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technicality 0
I had the same problem, but then i turned up the potmeter (current setting) on the stepper drivers. I measured it and put them on 1.1A and it solved this issue for me.
In my experience only machine which are running less smoothly have this problem.
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