He is a male, roughly 6 months so hes still very young....and I must say he does have surprisingly big testicles for such a small animal so that could be a factor!
Ive only had him here a week, Ive let him have a good run around the bedroom away from the dog where its nice and safe for him... but haven't let him out so much as i wanted him to settle in a little before he has me chasing after him ha ha! luckily he climbs back into his cage when hes had enough so saves me the chase.

On the whole he is very chilled, spends 90% of the day relaxing on his corner porch watching our daily activities, but his pacing looked to be a little erratic..
Thanks for your help, will get him out more regularly as hes settled very quickly in the transition from the shoe cu board tucked away to the living room where he gets plenty of interaction..

hoorah for chipmunks