The aforementioned camera lens has just done something weird. I am using it with a canon EOS D60 and I switched the lens to manual and...well... the button is stuck I seriously don't know why but the button wont budge and im really worried cause some functions on the camera are starting to act weird as in the shutter delay is abnormally long when I switch to cirtain modes. Does anyone know if this is a problem I can fix myself?