Solution
just thought I would share what happened to me:
i changed both of the fob keys to no avail - it was the car batteries.
So the V40 has a main battery and then a smaller battery - the smaller battery charges off the main battery and I assume that was dead - because the main battery was almost dead (battery warning message).
I opened the car with the manual key and then started the car and kept in revving at around 3000 rpm for an hour.
This didn't solve the problem immediately but it did charge the main battery ( check with a meter) then the next day I did the same thing, then the third day it worked.
The smaller battery trickle feeds off the larger one so I think the consistent charge on the larger battery solved he problem.
Hope this helps!
Every thing works now - i will make sure to use the car at higher revs a a bit more and also vary that with the out door temp fluctuations
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