Originally Posted by Ladyrav
We have had snow here in the uk and it has been since then, do you think it could be temperature related? If so, is there anything I can do about that?
I have never heard of a problem with the remote door locks, being related to temperature, but we can't rule out the possibility.
It looks like your temperature last night was -1'C and your daytime temperature was +1'C. So that is a very small change to explain why the locks don't work in the morning, but work an hour later. In comparison our temperature last night was -30'C, and I don't think anyone here had a problem with door locks.
The next time the locks won't work, try walking all around the the vehicle while trying to operate the FOB, see if a particular location works better than others.
You could also start the engine one morning to let the interior warm up, then shut it off, and then try the FOB again. If the problem is radio interference it is unlikely to go away during the 5 minute warm up period. If the FOB works after the warm up, it is probably temperature related. If it still doesn't work it could be interference.
If the above test shows that a 5 minute warmup doesn't solve the problem, then the next day you could also unlock the door with the key, and quickly drive a block away, park the car , and try the FOB again. If it works at this new location then I would be looking for an interference problem again.