Check your warranty. CRC offer 2 years on the Sun equipped bike I bought from them.
My experience of Sun Freehubs (or at least theJumping Flea) is not good. Mine packed in after a few weeks then again after 6 months. CRC were very good and replaced under warranty but the third time it happened I told them enough was enough and they replaced with a Hope unit.
The JF hub uses a needle roller bearing on the outboard side and a small catridge bearing on the inside. The Hub is badly sealed from a UK conditions p.o.v and the needle bearing quickly gets contaminated. The biggest issue is that you cannot remove either of the bearings and you are forced to purchase an entire Freehub >£100. Ludicrous...