Starting Jolla doesn't always work.
Everytime my jolla is turned off I'm having serious difficulties turning it back on. I can turn it on by connecting charger to wall socket (charger in car does not work), but even then it takes random amounts of tries until it turns on. Using this method it takes about 5-10 minutes to get the phone running, up until that it just shows the jolla logo and flashes the red light. I've had this issue since the update in june and the first time it occured I had 78% battery when it didn't turn on.