920 not recognising text contacts

[NickTB]

Hi all.
So I've had the 920 for a couple of days now and I've noticed a strange problem. When I try and text a contact, I type in the first couple of letters and on some contacts it shows as if there's no contact by that name. When I checked my contact list it's there. So I type in the number manually into the text and it recognises it...

Does anyone have any ideas on this?

Thanks,

Nick