Debian 8 (Jessie) failing to reboot from the command line.

Hello all, The title says it all really. It looks like it may be a kernel panic.

I’ve now got three installations of Debian Jessie and they all hang on shut-down, using the reboot command via ssh or even at the server itself.

Clearly, it’s a major issue when these machines are situated at remote sites.

Have any of you guys come across this and have found an answer to the issue please?