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We had unfortunately a very similar issue with our F34 twice this year, once in August and once in December. Both times the day before we had pretty strong rain.
In August the dealer was needed as the amplifier was completely gone and by this we recognized it as it was painfully silent in the car. They did not really found the root cause but the pipes from the pano roof seems to have been blocked. They cleaned them and all was good until December.
This time the amplifier was not gone just temporary not working. But they still did not found the root cause.
It cannot be linked with the active spoiler, this water is just not getting anyhow inside. It has to come from another spot.
Please update if someone finds a possible spot where the water is coming inside.
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