Having to reinstall Battle.net

I have a friend who told me that whenever he restarts his PC, he has to reinstall the Battle.net app. He said it’s not a big inconvenience, since the download and install are both quick, but is sounded like a bizarre bug. Has anyone else experienced this, and if so, did you find a fix?

Thanks in advance for any help.

Sounds like your friend has something managing their installed applications (like a drive sync) or they have a corrupted install area/drive.