Key fobs work at 433.92Mhz whilst 5G in UK will work at 3.4 - 3.6Ghz initially so way apart in the frequency spectrum. Even 4G is between 800Mhz and 2.6Ghz. So it unlikely that interference from these sources is the cause. This 433Mhz band (its called LPD 433) is used for a number of other Low Power Devices including garage or gate openers and some outdoor home weather station products. But such devices would have to be very close to overpower the key fob transmitter when the latter is close to the car.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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