Domino8 server "Ubuntu" router problem

Hello,

if got the following error Message in Domino 8.0.1.

After this the router hung up.

Router: Error searching mailbox file mail.box: Insufficient memory- Router message queue is full.

I only found some informations and hotfix @ domino 6.5.x and 7.x.

Are there any further informations to prevent this routerproblem next time?

Thx and greetings from germany

escp-eap