Dovecot mail connector fails once per week

[Aeoran]

Hi,

I have a community edition of Zentyal 3 installed on its own VM with 1GB of RAM, fully patched to 3.0.7.

Ever since upgrading from Zentyal 2, I have noticed that the Dovecot connector to the groupware mail simply fails exactly once per week.

The only thing that seems to fix the problem is to reboot Zentyal completely once per week, whenever the connector fails.

Could someone kindly advise on how to address this issue?

Zentyal 2 was rock solid.  Zentyal 3, not so much.

Thanks!