Easton Vista SL

Hi guys I have just changed a cassette on my Easton Vista SL and have noticed that there is a bit of wobble with the cassette, only about a 2 - 3mm side to side movement. Is this something to worry about if so is it easy fixed? I am hoping it's just a case of tightening a nut or two, but would rather get feed back from you guys before I jump in.
Thanks
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Turned out that the body that the cassettes rings were on was skewed slightly. There was a bit of play in the whole cassete body which meant it was skewed when I put it on.
Tightening up the lock ring didn't straighten it either.
I took it off and made sure the body was straight and square to the rings then put it back on, made sure it was still square and tightened it up. No wobble and still works fine today.
Cannondale CAAD9
Kinesis Pro 5 cross bike
Lots of bits
Just a thought, my front ring is a 48 / 39 will that have any bearing?
I'm guessing it's the bearings that have gone on one or both. I assume vistas are sealed bearings and 5000miles on them doesn't seem horrendously poor to me.
A lot would depend on what was involved in those 5000 miles, weather, road conditions, maintenance interval, your power/weight, riding style etc.
I'm sure some people will have got xxxxxx000 miles out of their bearings but then some on here only seem to get a few hundred
Strange how it coincided with changing your cassette though. :?
Cannondale CAAD9
Kinesis Pro 5 cross bike
Lots of bits