My 2016 Crosstrek with 30K mile has developed a problem my dealer and one independent shop can't fix. When idling in traffic and press on the accelerator to go nothing happens. The engine remains idling in gear. When the accelerator is released and pressed again the car goes as normal. Only happens randomly but seems more often as time goes on. Been doing this for about 9 months now. My dealer and local independent repair shop tell me there is no codes or alarms being logged in the computer. No alarms on dashboard. Any ideas? Thanks, Bob.