Issue Loss of interface 2, assignment and restart necessary

[Myrlo]

Hello,

I have an OVH cloud instance with Ubuntu 18.04 installed and Plesk Onyx 17.8.11

I use 2 IP addresses, one for Plesk + some domains and another for domains.

Sometimes (when an update I think, always in the morning around 7am), the second interface is lost.

I have to manually restart the interface and nginx :
ifconfig ens3:1 51.38.***.*** netmask 255.255.255.255
service nginx restart

I disabled general updates (which I do manually) but kept the updates reliable.

Log this morning
127.0.0.1 admin [2019-02-19 06:28:22] 'Subscription's disk space usage updated' ('Client GUID': ...)
127.0.0.1 admin [2019-02-19 06:28:22] 'Subscription's traffic usage updated' ('Client GUID': ...)
127.0.0.1 admin [2019-02-19 06:28:23] 'Update Domain Status' ('Client GUID': ...)
127.0.0.1 admin [2019-02-19 06:28:23] 'Update Domain GUID' ('Client GUID': ...)
127.0.0.1 admin [2019-02-19 06:29:44] 'Upgrade extension' ('Extension Id': 's3-backup' => 's3-backup', 'Extension Name': 'Amazon S3 Backup' => 'Amazon S3 Backup', 'Extension Release': '56' => '57', 'Extension Version': '1.3.0' => '1.3.0')

Does anyone have an idea of where the error may come from?

Thank you