I do not have good news. Today i saw the error “IDE required a restart” again. So it still seems to happen also with the newest plugin version. The worst thing is, there is no exception in the idea.log anymore. So i can not give any detail, what could be the reason 
. But the MAX_INT error is not shown anymore.
I checked the new plugin version with a colleague and we both had connection issues with the SonarQube server before the error occured. I described this issue here: SonarLint 10.4.2: analysis hanging with newer plugin-versions in IntelliJ
Not sure, if this is linked somehow.
I continue monitoring the issue and report back, when something in the idea.log comes up.