Random code unfolding on current file if ctrl+s (save) is pressed

Whenever i fold some code (click on the arrow aside the line number in the code editor) wether it is a function, namespace, construct or loop, if i edit the document and press ctrl+s the folded lines start unfolding one step at a time This makes use lost the focus and makes the useful code folding feature not usable.

Looks like a overlap of some key shortcuts, but i checked and didn't find any.