Hello there, Zeissikon.
Apple has released 8.0.2 which resolves the issues reported with the update you are referring to. The following Knowledge Base article walks through the steps on how to get that current update:
Update your iPhone, iPad, or iPod touch iOS software
https://support.apple.com/kb/HT4623
If you'd like to see all the features of the 8.0.2 release, this article provides some great in-depth information:
iOS 8.0.2
http://support.apple.com/kb/DL1758
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro