I did a fresh install a month ago and managed to iron out all minor technical shortcomings myself. All except one: at no particular point (I click a link in the browser or do some GUI stuff in some other app, sometimes I almost do nothing) the whole GUI freezes for 10-20 sec. Sometimes only one window freezes but and I can minimize-maximize other GUI windows. But after ~5sec. all freezes. Strangely it is not 100% frozen (for example some time in the terminal still runs), just the GUI part. Somet...