V60 T5 2015. My drivers door won't lock with a key fob or from the locking buttons on the door. Only way is to use a mechanical key - or - the black screw-like car locking switch. Sometimes doors closed light indicator on the door panel is lit or even green light on the fob when I check it with the -i- button - but the driver door remains unlocked. More often light stays off and fob says correctly that it's unlocked.
I have fixed my keyless entry recently as I hoped it's something related to that - but nope... no change in the lock itself. Door unlocks but doesn't lock via fob or keyless or button on the inside.

Edit: Today morning it was a bit cold and door worked perfectly. When sun and temperature went up lock stopped functioning again.