i've just created a new group and added a few members. after its creation, the application crashed, and i am not able to launch it anymore - it crashes right after starting - i get a "Connection closed by server" message at the bottom and it immediately crashes - how can i fix/find the cause for this?

i don't know if this is related, but before it happened i tried to change the subject a few times.

[Update]
i am trying to connect from an android device with same number and getting: "Your phone number is banned from using WhatsApp. Contact support for help."

wow... is this solvable?