When I use my key no lights come on at all. If I try testing it on a station with a red light then even that goes out! This all started a few days ago and I haven’t been able to hire a bike since. They are sending me a new key but I wonder what made it fail in the first place, the key isn’t physically damaged and has not been near magnets etc. Is there anything else that can break it – too close to mobile phone etc?