No1 experienced this? I've read a few threads but there's not a definitive answer.
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Had a similar experience to the above and eventually had to replace the roof mount with shark-fin c/w extension lead - now perfect every time.
Fitted the puck I removed from MKV into another vehicle MKVI and it worked perfect in that vehicle for the local area.
Took that vehicle (MKVI) to London and it failed sadly - returned with the same vehicle with another Shark-fin same as fitted in my MKV and it was perfect!
So could be the puck isn't good enough for her local area!