It sounds like a fault and could be the secondary battery is failing. If you just bought it, ask the garage to test both the batteries. One is in the engine compartment and other behind the passenger floor mat toward engine fire wall bulkhead. These cars do strange things with bad batteries.
Good luck and keep us posted on how you get on 🖐
Helo i also have a problem with my boss systems radio on infiniti Q30 2018, no sound and the Radio, Fm, AM, CD, BLUETOOTH, APP functions do start. only sound in phone call.
i replaced the radio unit and it's the same.
I checked the 2 battery, they are good.
Do you have any ideas, Please