Quark uninstalls itself from time to time and I have to install it back again.
It happened many times and I don't know what causes it, and I don't have any log to submit that shows the problem.
I only know that it happens fairly often.
I hope that this can help and if it's only my problem delete the issue, i don't want anybody losing time if it's not worth it.

This isn't Quark. This is likely an issue with some kind of Antivirus and a false positive match on the Quark JAR.