About 70% of the time, I'm unable to turn on the radio. Have taken it to the dealership and told the electronics all check out ok. I sent a video of the dead radio (with car running) to the sales rep, who suggested the radio might be in sleep mode and advised to tap the screen instead of pushing the switch. Did that and still no response from the radio's black screen. Next time I entered. the car, the radio was working. Any suggestions?