Exposure Keeps Changing!

[DJHaze596]

I did a search before posting.  Found nothing that related to what's wrong.  When in Video Mode on my 600D,  The Exposure never stays locked,  ill get my exposure and then it will Brighten like for example when i focus.  It's so annoying.  I know your supposed to Manually Focus in Video and i do but i do like to make sure im in Focus before turning it to Manual Focus.  and when i do Focus Automatically.  90% of the time it Over Exposes.  It's so Annoying.  Even during Video Recording,  Sometimes it will just go from a Perfect Exposure to an Over Exposed Image.  Any Ideas how this is happening?

[Francis]

Turn off Auto-exposure under the Canon menus.

[DJHaze596]

It is off,  Would Auto Light Optimizer on Effect it too?