Musescore 4 go down every now and then

I give up! I have been using Musescoure4 for a week or so but everytime the programme shuts down, either totaly or only the score I´m working on. When I try to open the score again it says that musescore wasn´t closed in a proper way, do I want to go back to where I were? I click Yes but nothing happens. Last time I could find my score some how but today I lost two hours work. Gahhhhhhh!!!

I reinstalled 4.0 and will go back to the old one.