Age of lamps? The circuitry for HID is "constant power" so over time as they wear, the current (or voltage I forget) starts climbing exponentially to maintain a steady output level, it could be just a warning to replace before they self destruct?

➀ age?
➁ turning blue?

If old enough or blue tint at all time to replace. I bought a great set via amazon for $40-50

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)