Connection lost with Thunderbird

Quite often my password connection to Thunderbird, that i configure at https://nc.torproject.net/settings/user/security 'Devices and sessions', stops working, and I need to make a new password to connect from Thunderbird.

I did generate a new password last month, but since some days it has stopped working and does not allow me to connect from Thunderbird anymore.

It was connecting read-only, but today is also not allowing a read-only connection.

Do I need to configure a new password each time this happens, or maybe I am doing something wrong?