I'd not done anything to raise any flags in quite awhile either (farming high spawn areas sometimes triggers it, as well as other things).

When I put in the ticket the GM specifically mentioned battlegrounds, I couldn't really make any other conclusion. They don't ever tell you the specifics as per both the ticket and the phone "this is handled by the security team and we don't have access to the details"...

I don't know how else to look at it - it's a workaround that uses unintended game mechanics. If it feels like you're exploiting something intended, you probably are.