We have had a number of reports that the VDR-4 & VDR-7 Digital Recorders have had a problem with the clock jumping back to 2010 following the new year.
As not all units are affected it seems likely that the problem is only related to certain older versions of firmware. Updating the firmware and kernel should resolve the issue. Please follow the steps in the guide and ensure that you only use the firmware for the specific model that you have.
Links updated 25/04/18
Below is more details on the upgrades provided by Neil in UK.
There are 3 possible methods of upgrading the VDR series: