ACROBAT is ABSOLUTE ****!!!!!

When I have a few PDF's open then I regularly get that when I go back to a document, then it does not display the document content.

I CANNOT REFRESH OR REVERT - JUST NOTHING!

IF I get a error message then it is about memory management! Wow - is that not your programmers job to sort it out?
Sometimes I cannot even save a edited document.
Pathetic. If I was not forced to use adobe at work, I would have used some of many available other pdf viewers and editors like I do privately that costs a fraction of your ****!