My new (5 weeks old) 2020 Outback radio the sound just stopped. Mute is not on. Everything else works fine. Screen everything. What could it be? I stopped and started the car a few times and that did not fix. same for FM/AM and XM stations. I tried again about 45 min later and the radio worked fine. Sound came back on. Is there something wrong with the radio? Should I take into dealership?