Have you checked that Chrome is up to date in Google Play?
We also mention this here: Somehow Kurviger does not Behave the Way I would expect it, what can I do? [Kurviger Knowledgebase]
If you are up to date something else might be wrong. Just to make sure, have you tried restarting the device?
Ah ok, das klingt nach Energiesparmodus. Hast du eine Ausnahme für die Kurviger App angelegt. Siehe auch: https://dontkillmyapp.com/