L322 Most bus / infotainment power problem

Hello guys, as the title says I’ve just bought a 2006 L322 TD6. The radio is having a problem where one of the modules in the most system is loosing power and causing it to reboot, I’ve checked the optical cables in the rear and all seem fine but I suppose communication would only be lost when the intermittent problem occurs. I’ve taken some videos within the radio diag menu and ordered myself the optical loop in hopes I can bypass one of the units to get to the bottom of it. From experience could anyone possibly guess what module would be causing the issue, the audio drops first for a few seconds then you can hear the CD changer do something then the screen drops out and reboots as well as the speakers giving a little thud when it cuts.

I’ve attached some pictures from the diag menu before and just as it cuts out before the screen switches off
Thanks in advance

The last picture before power cut:

11v is very low, your battery needs a full charge then a test