Loss of power whilst driving - two dashes / lines and flashing D

I experienced a bit of a problem with my Twizy whilst driving home this evening.

After driving for a couple of minutes my Twizy lost power giving me no option other than to coast to a relatively safe place to stop.

The display was showing two large dashes / lines where the speed should be and the D indicator was flashing.

Turning the key off and back on again cleared the fault and all was well from then on.

When home I wondered whether there could be a problem with the PowerBox connection as this is required to be connected when in Max Power setting. I found that switching off or even uplugging the PowerBox didn’t cause a problem so it appears to only need to be connected on initial starting.

Any advice or similar experience would be much appreciated.

It’s made me slightly apprehensive about driving it!