[otrs] Search function on 3.0.9 suspect

Hello, Anyone else seen strange behaviour on searching for tickets in 3.0.9. a ticket i know exists has a subject of "COPA: New Users for JPA" (without the quotes). my search criteria and the results, based on a search ONLY using subject field: full subject - no result New Users for JPA - no result new users for jpa - no result (ruling out case sensitivity) copa jpa - ticket is returned (successful) why would searching on that last subject text work and the rest not. I thought maybe the ":" was causing it but it's not. is a subject search restricted to only a certain amount of words, surely not, that would make little sense. thanks Neil