T2i... aperture issue!!... help please...

Whenever i want to make a smaller aperture in movie mode, from F1.8 to F16 for example, i can't do it, the display indicates that i am changing it, but the picture stays the same, this is really weird, 'cause when i do this in Manual option, for photos, it works... maybe are the lens contacts, 'cause also, when i want to take a picture in some options like again, Manual Option, i get.. Er 01 the lens contacts need to clean etc....
Has anyone experienced this?... if so, what was your solution... just want to know if i can solve this before calling Canon... thanks, hope somebody can help...
 
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