Default Bugreport + Google Now

I have two problems:

a) i get bug-reports out of nowhere from time to time. No problem with any apps, everything works fine, but then i get a bugreport-notification that i can send via email or something else. I think i found out how to disable this, i turned on and off the debugging feature. But i never used this before, so why did this happen?

b) sometimes on my homescreen i can't do anything because the google now bar is activated. I have to touch the bar on the bottom and sometimes even have to open google now to use my homescreen again. I already disabled the google now shortcut with an app from the store, but this does not helf, the spotted ring is still coming up. Any help? Maybe a problem with my screen or with my display-foil?