temporary failure of a Xenon headlamp

Moin, last Friday my left xenon headlight became dark for the first time. Was really off and only the re still burned. After setting off the engine and starting again was until just calm. Now it is out again. After the light off and turn on it went again. However, the joy did not last long. I can’t quite understand when it falls off. Before I now roll into the workshop and the headlight there does not fail I wanted to ask if someone knows the problem and in the ideal case maybe also has a solution ready. Already annoying if you are constantly dependent on the elk and its cargo space and it is now morning and evening or already dark. By the way, it’s about an XC70 D5 EZ 2009 with now 213,000 km. Greeting Thomas