Unity 5.3 UI Glitch in runtime

Hello
When I apply graphic changes in the built game, in runtime, weird graphic and UI error appear.
Here’s an example of the error:

But when I close the game a couple of times, the error appears fixed, of course this is no good solution.
(Again, when I change the graphic settings, the error appears again)
*IT APPEARS MAINLY ON CHANGING Screen Resolution
Is this a unity Bug?

This is a bug in 5.3. After porting my game from 5.2 to 5.3.x the problem arises only upon changing the graphics settings - this was not present in 5.2. This very bug was present in an earlier release of 5.2 which was then resolved. However, it has returned in 5.3. So this isn’t your problem. Just got to wait until they patch it.