Wargaming put an announcement across all servers today that they have a security breach and there is some potential that some usernames and passwords have been stolen. As a result they are engaging on a major push for people to change their passwords, and to aid this they have offered a 300 gold reward for changing your password.
This strikes me as a good move – and should remove most of the annoyance. Three hundred gold is the full price of a garage slot or barracks enlargement, so it is also a useful amount. I have changed mine and had my gold balance credited, so I suggest everyone make use of it. Besides, changing a password is good practice anyway.