[Tiberius 73]

I have a 2009 X5/E70 which has intermittent issues when driving over rough surfaces such as cobble-stone streets or similar; speed bumps and pot holes don't appear to be an issue.

The problem manifests as a very rapid series of gongs from the cluster and various errors popping on and off. This is similar to a dead battery in that with a dead battery all sorts of errors come on (I had a bad alternator a year back where this happened) and stay on. But in this case they come and go very rapidly.

The errors set in the ECU are numerous and never exactly the same, but some do appear to be persistent:
002E82 DME: Electric coolant pump, cutoff
00CDB9 Message (status EMF, 0x201) faulty, receiver DME, transmitter EMF
006F4E No Message (EMF, 0x201), receiver DSC, transmitter EMF
006DE6 DSC: Sporadic EMF fault. No repair measure necessary.
00600C EMF: Button, parking brake: signal error
006023 EMF: Control unit: faulty power supply
00A558 No message (parking brake), receiver KOMBI, transmitter EMF

There are usually a few other ones, e.g. 009CCD (FRM: Drive, mirror, driver's side, faulty), or it can be the passenger sied. Or other random FRM module errors, or other errors from other modules, e.g. DSC, DTC, ABS and 4x4 (all coming together or not at all).

It feels like a power issue, although the battery is connected tight. Alternator is new. All connections seem tight.

EDIT: Worth noting the car is driven on bad roads a lot. For all 140k miles of it's life.

Any clues?