We've recently obtained a Phantom 2 (with ZenMuse mount). All things were working well however, after a firmware update I have the following issue. The Phantom starts off fine, props spinning etc however when I left stick up for lift off I get some thrust however not enough to lift off the ground. It is like it has been limited or something. I can also pitch forward (right stick up) however as not off the ground this just flips over the unit. Has anyone had this or have any thoughts on why I've lost majority power?? Thanks.