Safeguard prevents hibernation mode

Hi,

I am using Sophos Safeguard version 7.00.2.23.

Since this was installed, I haven't been able to use the hibernate mode on my laptop. Whenever I put it in hibernate mode, it restarts to come back to the Sophos login screen after 5 minutes or so. My battery ends up completely drained and I lose any work that I had purposely left opened.

How do I fix that?

Thanks