Nextcloud android 3.2.4 is not working (no good comms with server)

Dear All,
Just installed 3.2/4 of the android app and now there is disturbed communication with the server. Continually I have a notification “Downloading 100% of Ima” the rst I cannot read and also not find anwhere.

I am working with server 13.0.6 just installed on new hardware. The android app on my tablet is 3.2.3 and works fine. I am so in trouble by this.

Nextcloud version 13.0.6
Operating system and version 18.4
Apache 2.4.29
PHP version 7.2

Best regards!

Dear All,
When I installed the NextCloud app bruteforce protection was on. It took look before the app was installed. Anyway I removed the bruteforce issues by allowing my IP and reinstalled the app. It works again like a champ!
Regards Cees