domains with SSL cert moved on another IP every night !

[NETIM]

Hello

I have a very strange problem

My server has two IP (one shared, one private)
Onto the private IP:
- I have setup a domain
- I have added a SSL certificate in the domain's repository
- I have defined this domain as the default one

All is running fine, the certificate is shown and all is OK.

However every night / evening, the domain is automaticly moved on the shared IP (The default IP of the server)
I have this problem for all domain names using a SSL certificate on different servers using PLESK 8.6
I have change my IPs to private, shared but it doesn't fix the problem

Any ideas ?