2012 v advanced technology package. It's our 5th Prii, 92k miles. Touching the door handles to lock has been hit or miss for a couple weeks and yesterday a new symptom started. When I get on the highway the traction battery indicator goes down until I exit and with brake depressed by the time I'm at the end of the off ramp the traction battery level indicator pops back up to normal near the top. Haven't pulled the rear cargo cover to see if battery has a date of installation (bought used with 50k a couple years ago) due to house closing and picking up corn to plant. Same thing today, sound like 12v battery failing to you?