CD keys getting banned for no apparent reason

I have been banned about 6 times since DayZ release for hacks but stopped doing it up until about a week ago. I then went ahead and purchased an injector along with a 1 day trail of some awesome hacks, got me banned by admins off a few servers but no global bans. Then 4 days ago that key gets banned, wasn't very surprised and assumed that one of the admins had reported me on the Dayz Forums.

Then I purchased a new key, after deleting all my hacks and injectors from my PC, played on a private hive completely legit for 2 days, then yesterday the key was banned while I was logged off and asleep. I assumed that either the key was also in use by someone else or something else unknown to me was happening. I questioned the key seller the next day who was kind enough to give me another key immediately despite not offering any warranty previously. I checked the key via Darkys Key Changer. It was not in use or globally banned. Changed my key to it, went into Dayz, joined a server, and was instantly globally banned.

I have no idea what to think at the moment and was wondering if anyone has any suggestions. If I spend the extra dosh on a legit CD key will it get globally banned the first time it is used or will it stay clean until I forsake it with hacking. Is the CD key seller to blame for whats happening? By any chance am I IP banned from Battle Eye and therefore is it worth switching my router from a static IP to a dynamic IP?

Thanks in advance