The bunding box changes and quality gets horrific

Hi!

After the last update I have had problems with ps. The bounding box is usually blue around the layer when you are on the move tool. When I start up PS everything is fine, but after a few minutes the whole program jumps and this box is suddenly gray plus the display of the canvas is noticeably worse.

There is no difference in the quality of the file when I save it, but it is the canvas I am working in that is of lower quality. Like the computer lowers peformance for some reason that I can't figure out in the settings.

I have a Lenovo Legion Slim 5 R7-7/16/512/4060/165Hz.

See the attached pictures of how the bounding box is first blue and then when ps jumps to it changes to gray. These are print screens from ps.

I have also uninstalled Ps and installed it again, but the problem is still there. 

So I want the blue box. I like it and miss it a lot. 🙂 And also not a worse quality on the peformance when I´m working in Ps.

Thanx for help!