Hello!
We have been seeing some reports that users are experiencing crashes after performing the iOS app update to version 1.8.1. We have done some troubleshooting with users here through customer service and determined that the issue lies with the updating process. We recommend that users experiencing these difficulties delete the app and re-download it from App Store, as this has resolved the issue with customers that have contacted us directly. Please contact Zeo Customer Support (http://www.myzeo.com/sleep/contact-us) if you have any further questions and we are very sorry for any inconvenience this may have caused.