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should I be worried about it?
Only if you're worried about it suddenly being a freewheel in both directions in the middle of a commute and leaving you stranded.
Is it easily serviceable? It's usually just a sticky mess inside causing the pawls to get stuck, and needs cleaning and regreasing. Or just replacing.
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Not sure, it's a shimano one. It's only been on the bike a few weeks.
http://www.planetx.co.uk/i/q/SKSHOEMBMX/shimano-dx-bmx-freewheel
Felt my freewheel slip a couple of times about 50 degrees where it just didn't engage randomly and then decided to bite. Seemed to then suddenly be fine again for a couple of hours, should I be worried about it?