Please perform a restart via the toggle switch. Before you turn on the device again, it should have been switched off for about 2-5 minutes.

If the error persists, please contact support. See this website for contact options.

SIn order to help you as fast as possible, please note in the support request whether the error occurred during the training, after switching on, or overnight.
In addition, we ask you to consider whether the error has disappeared after one to two reboots. Please do not switch off the device in case the error is sporadic until our call.