Alternate option f11 gain access to - minimize

[allen meyers]

On a much more frequent basis my available screen takes over everything.
Depressing f11 either once or twice only revels the - a nano second. And
in gmail when this happens even bookmarks and as an example clicking
Ubuntu forum does nothing. The screen is like frozen. Again to make
myself clear pressing f11 only moves the screen down for a moment.
Please advise

Allen