Busch and Muller Toplight Line Plus with standlight problem

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My bike commute is now around 8000 miles a year so I greatly value decent dynamo lights light those from Busch and Muller, especially this model which also works as a brake light.

Recently the standlight stopped working the instant the front wheel stopped turning. Normally the standlight continues to illuminate the lamp for about 10 minutes after I stop pedalling so something was clearly wrong.