After the overnight rest when the fob doesnt work in the morning make the following test, unlock/lock with key without opening the door then unlock with fob ...if the fob works after that the only fix is to replace the BCU cos it's internal timer is mixed up and no tester can fix that, even though the following bulletin is for NAS i've seen it in my country too (433Mhz here) :
http://landroverclubvi.weebly.com/up...8601nasf_2.pdf , if the symptom is more irregular it can be a roof receiver missbehaviour, usually due to weak earth
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