Immediately following the 360 'upgrade' our V6 box is EXTREMELY noisy - the fan is constantly spinning and when watching TV it spins up and down, up and down, up and down......not the hard drive, certainly more akin to a cooling fan.
I have set the box to eco mode, however it's still so noisy and really noticeable even over moderate to high TV volume!
Before the 'upgrade' the box made next to zero noise.
Is the new 360 software placing a high demand on the hardware which means it's getting hot hence high fan spin? Or, is it our ageing V6 box not up to it? (over 4 years old).
From settings the hardware version is ARRIS-DCX960-MPA+
If you have checked that the vent underneath the box isn't blocked and are sure it's the fan I would suggest you phone Virgin and report a fault as it's not normal. I would also suggest you set the box back to fast or active start especially if you have 2 boxes. You can always try doing a factory reset before you call to see if that fixes it, it will be quicker than calling and I am sure it will be suggested by 1st line support when you do get through.