If I clear cache the module stops working

Mobile Detect does not work with 10.1.3 Drupal version so, will be the same problem with newest editions, I think. This is very annoying.

I tried to reproduce your problem and I was waiting any other feedback, please try the latest release and let me know if you still having the same issue.

Hello, with what version of Drupal, this problem no longer exists, since apparently it is a cache problem that was solved in version 10.2 so that you no longer have to deactivate "Internal Page Cache"

Thanks @Nelo_Drup, I'll check it and update the documentation.