Illustrator CC 2019 not responding

Hi!
I can't work on my Illustrator CC 2019! Almost every time I open a file, Illustrator is not responding. And I have to quit Illustrator!
It happen again and again. I can't work with it. I have quit Creative Cloud, and start up again, also quit my computer and start up again - but it doesn't help. So I have to work with Illustrator CS6.
Another problem I have is when I want to move an object to a guide line, - the Illustrator CC 2019 will not let me place the object on the guide line as I want, but Illustrator CC 2019 place it a little bit from the guide line. And I move and move the object to the guide line , but it won't let me put the object on the guide line which I want.
But in Illustrator CS6 I can do this, - I just placed the object on the guide line as I want it to be, - And "boom" it is on the correct line!
Why does this happen?
Could somebody help? I am very sorry that I have work in Illustrator CS6 to get my work done?
