Unpleasant experience with the processing!

The filter does its service, also has good quality - with the big brother I have had good experiences!
But the little one hanging here so firmly on the lens and suddenly could no longer take off that I had to turn the filter to get him down! Psyched hard he was not, I do not know what was going on.
However, I'm going to screw no filter, no more.
Too bad, because the glass has a really great quality!