Yes I actually lodged a formal complaint with VKool on this and even showed them the poor GPS reception on my iPhone 6 and Note 4. These 2 phones would get quick GPS locks in my other car with OEM20.
However, when I upgraded to a Note 5, I would get quick GPS locks regardless of tint, so fast-enough hardware can overcome the interference from GPS.
Their HQ didn't honor my complaint saying that only RFID has interference, but my service advisor allowed me to change my windshield tint anyway, citing that it was possibly a bad batch. Didn't push through since I'm sure it's an inherent VK problem and retinting won't solve it.
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