Please execute a restart via the toggle switch. Before you turn on the device again, this should have been switched off for about 2-5 minutes.
If the error persists, please contact support. See this website for contact options.
So that we can help you as soon 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. Best, you do not switch off the device when the error is sporadic until our callback.