Join Date: Jul 2005
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Could be radio frequency interference from a local TV/mobile phone mast, or someone with a high-power VHF radio (radio amateur, PMR user) that happened to be close to your car when you tried to unlock it.
Currently in Ivor_E_Tower's garage:
2014 Captur dCi EDC; 2014 Ka 1.2 Zetec; 2015 C-Max 1.6 TDCI