Bump this bad boy same problem here on my game same thing cant rank up champions all of the sudden and it worked fine yesterday. I also submitted ticket. Everything has been playing perfectly till this issue.

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It fixes the problem, make sure you don't delete your data when you uninstall.

 open the command line with the Win + R key combination;

- enter the control panel, go to Uninstall programs and uninstall Plarium App;

- press Win + R, enter Regedit, then open the following path: HKEY_CURRENT_USER \ HKEY_CURRENT_USER \ Software ;

- delete both folders - Plarium and PlariumPlayInstaller;

- in the same registry editor, press Ctrl + F (keyboard shortcut for a quick search), type Plarium in the pop-up window and delete all the items associated with the name;

- after deleting all folders and files that contain ""Plarium"", reinstall the application from the official site plarium.com.

Same Here, and the response I got.

Plarium Team (Plarium Support Center | Mobile Games) 

 Nov 19, 2020, 22:31 GMT+2 

Hello!

If you cannot log into the game or are experiencing performance-related issues, please try one of the following workarounds:
1. Change your connection method or use a VPN service to switch your IP address (e.g., Turbo VPN for mobile devices).
2. Run the game on your PC via Plarium Play launcher or use a different device:
https://plarium.com/en/plarium-play/

Please check the answers to some commonly asked questions:

• Faction Wars: The game gets stuck at the end of the battle The error occurs when you exceed 1000 turns. This limit prevents the game server from being overloaded with infinite battles. Please try changing your Champion Team to beat the Stage quicker.

Check our Raid Knowledge Base to find guides, FAQ, and info on the current server status: http://plrm.me/kb_tech

We also have an official Discord channel, where we post information about the maintenance periods and server-related issues. You are welcome to join it at https://plrm.me/raid_discord

Our support team will contact you if additional investigation is required. We also don't give compensations on a case-by-case basis.

Thank you for helping us to improve the game!

Same probleme for me !! 😫

Same problem :-(

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