Acronis reboots server on every backup

Hi,

We purchased Acronis Backup & Recovery 10 about a year ago. We are using it on a 2-year old Dell PowerEdge server.

Everytime we try and take an image of the C: drive, it reboots itself about 30 seconds - 120 seconds into the image process.

I also downloaded a trial of B&R 11, but it does the same thing.

Our server is running Windows Server 2008 R2, has 16GB of RAM, and 3 HDD in RAID 5 using a Dell Perc controller.

I've checked out the drives, scanned them for errors/corruptions, but there are none.

Any advice?

Thanks