I have a 2009 V70 and have a similar problem. Sometimes it fires right up, other times, I hear the steering unlock, the dials show the time, fuel, odometer etc, but no other lights and it fails to start. Taking fob out and putting it back in sorts the issue *most of the time*, but sometimes it will take 3 attempts. It got progressively worse over the last few months.
Both car & fob battery are new.
One thing I noticed recently - if I push the fob into the slot a little (not too much force, but more than the slot does on its own) while it's being pulled in, then it seems to fire up on first go more often.
Not sure why that would be.
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