I have this problem too. Happens about 50% of the time. So, I use the key, big deal. Somewhere the fob isn't linking with the car. It's not something I worry about.
Alright, well thanks, I guess. I worry about it.
Terminals on battery are fine on both, it's not a power issue as the car unlocks fine with the key, and the key works instantly once manually unlocking.
Hasn't happened again yet, hope the key reset worked for whatever reason.