Do you have multiple keys and are symptoms on reach? (Best to determined if the weak signal is on the key or car side).

Also; same symptoms independent on locations it's somewhat possible for localized interference. Long ago one of my car remotes would not work in downtown Chicago I had to use the key which set off the alarm until I put the key in the ignition.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)