I'm having a similar issue that had begun after months of use. It is also semi intermittent too. The bulbs are still fine as when I check them when they actually work they are fine
Weak or intermittent contact can cause this.
The lights (check both socket and wiring plug at the back) in the rear bumper are renowned for rotting out creating this scenario.
Cheers. I had a look today and I noticed the front holders were not making great contact so I readjusted them. Now they are working fine. Hoping they hold on.
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