Calendar event notifications have no more sound on Windows 10?

I’m using em client for almost 6 years now and just recently migrated to Windows 10. On Windows 7 I always got a popup AND sound notification for my google calendar events. Now on Windows 10 I only get the popup.
I can’t seem to find a setting for this. Any help would be appreciated.
OK, I disabled and reenabled the sound notification for “notifications” and now it seems to work, although the notification always appears in the background of other windows for some reason. Is there maybe a way to change THAT? x-p
OMG… After a restart the sound is gone again, and the notifications appear in the foreground again… Please let this be a bug… Makes me mad.