We have just started getting same problems on RRS 07 TDV8 HSE, 134K. Had two electrical issues in 6 years driving until last week. few years back replaced a rear parking sensor and just before christmas had to change another one

On a santa visit to my folks before christmas we had a rear left brake light bulb blow but it did not signal on the dash, which i thought all bulbs did, A car flashed us to tell us and we called in at halfords and did both sides put in two bosch bulbs (best they had) of the correct type, Whilst up north I noticed one of the front sidelights was out, again no indication in the cab, again Halfrauds to the rescue and fitted another Bosch bulb. Then on the way back about 200 miles from home I noticed a shudder when accelerating out of roundabouts or from stops, after my wife googled we then understood LR's 150K miles gearbox oil change is woefully over the ZF manufacturers figure of 75K kilometres, huge gulp and didn't drive the car over christams as we booked in for a gearbox flush

Last week had a gearbox flush, new metal sump fitted and new filter plus 150K service with all oils changed plus the front ARB bushes changed. Got car back and experienced the faults as described, up to now only happened when driving so doors are locked

Doors unlock, sounds like all of them
external hazards, no sign inside
radio deisplay says "system fault, shutting down, then Satnav starts to shut down, buttons start greying out until it all goes out so both radio and satnav screens are blank
Heating blowers all stop
EPB flashed red for first 3 times of this shutdown
Suspension/DSC fault light illuminate amber, rest of instruement cluster stays working

After about 30 seconds the systems seem to reboot and hazards go out doors lock, blowers come back on, satnav and radio both reboot, only thing left is the amber suspension/DSC light showing. Ignition off, wait few mins and on again seems to reset until next time

In the space of a week this has now happened 8 times, so quite frequent

I have been back to flushing garage as none of this occurred before they worked on the car, they were helpful in looking at the undersaide but said they could not have done anything and would be very happy to look at "my fault"

I have had my breakdown company out twice as its happened on the road and at the second time the battery was changed as its state of charge was down to 25% even though I had driven near 190 miles and used a CTEK MXS7.0 charger to charge the battery just in case. At this visit they also diagnosed an open diode fault on the alternator, which has now been replaced with another genuinbe LR one. YLE500430

We have experienced the fault again three times and a specialist has today said their diagnosis (and talking with LR technical engineers) points to the Instruement cluster as the likely cause. Quoted over 1K to change but caviated that they couldn't guarantee it was this and I need to sign some paperwork to say I would pay for this even if it turned out not to be the fault!

I have got the car on the drive, it drove beautifull, silky smooth gear changes and no judder. Tonight I have done some googling and used both this and the disco forums to start putting together a plan of checks to do this weekend. i need to be certain all the simpler stuff is ticked off before I sucumb to the gamble of a new Instruement cluster.

My question is regarding the IID tool being able to reprogram a used/scond hand Instruement Cluster, I have been told by the garage that they can only be new ones and are VIN coded once to your car such that they are not interchangeable. Is this correct given what is mentioned about the tool from Pete

Lastly if anyone has any suggestions by recognising the symptoms and their sudden onset in the last 7 days, any thoughts welcome

Thanks in advance