Office Web Apps - SSL Certificate Settings deleted for endpoint : 0.0.0.0:443

Hello,

we have a problems with Microsoft Office Web Apps running on Windows Server 2012R2.

There are Microsoft Office Web Apps installed and every time the server is restarted, SSL certificate bound to the IIS site and specific binding (named HTTP80) is deleted, so one has to go and manually set the certificate on the site.

I was able to find one similar problem:

https://support.microsoft.com/en-us/help/2025598/https-connections-fail-and-ssl-bindings-are-deleted-for-a-website-in-i

but this is not the case - there is no such key in ApplicationHost config.

Event logs only specify that the IIS was killed, SSL certificate deleted and IIS was brought back on right after / during the start of the OS...

Any suggestions?

Thanks,

Jakub