Just started having this issue, sometimes when I get in the car and push the power button it doesn’t go into ready mode, everything else comes on like when you push the button without applying the brake. I can turn it off and try again and still won’t go into ready. I can come back later and try it and it will come right on like normal. I have checked the 12v battery voltage when it did this and it was about 10.4, not sure why the voltage was that low either it has a fairly new dealer battery and seems to do this more often when I get in the car after work.
charge up the battery. if it won't hold 12.7v overnight, take it back for warranty replacement. another issue can be the brake light switch on the pedal, it might need adjustment.
Or check for parasitic draw while off. Should be 15-30ma. 90ma or more can cause issues. Some have had several hundred ma which will discharge a battery quick.
