[Evolution] Evolution 3.10.4 forgetting passwords

[Ove Edfors <ove edfors gmail com>]

Dear all,

I'm using Evolution 3.10.4 with evoultion-ews (on a Linux Mint 17.1 desktop) to access my e-mail and calendars on an Exchange server. Evolution keeps "forgetting passwords" and typically give the error message "Cannot create calendar object: Authentication failed" when I enter a new event in the calendar. When this happens it doesn't seem to recover and the only solution I have found (by searching on the net) is to erase Evolution passwords from the default keyring in Seahorse and restart Evolution again. Evolution asks for the passwords again and it seems to solve the problem temporarily. Unfortunately, it appears again and again.

Is there a known remedy for this? 

Regards,

Ove Edfors