red dot

Hello, I was wondering if any of you guys could figure out what is wrong with my monitor. There seems to be a 0.5 cm red dot near the middle of it. It appears on dark backgrounds, most noticeably on a black background, but it's barely visible on lighter backgrounds, no sign of it on a white one...

Hello. As I described on the title, sometimes, explorer.exe restarts itself randomly. I don't know why! ( Windows 10 64 bit Creator' s Update 1703. ) Any help?