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so I have a '16 F82 with an updated V1 mounted the same way with suction cups, and I've had no issues at all. my brother has a '15 F82 and ditto: updated V1 mounted the same way and no issues. couple months ago he bought a new 540, mounted an updated V1 that was in his X5, again the same way (we thought) and the thing went bananas, just like previous posts. bottom line: it's the mirror. in both M4s the unit was more than a hand's breadth to the right of the mirror, in the 540 the unit was exactly next to the right side of the mirror. moved the V1 farther to the right and presto! fixed!
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