Did you try a Hard restart of the system by disconnecting the battery in the boot?
The system does not totally turn off when you turn of the car. Some components just go to suspend/sleep mode. If one of those are hung up, it´s possible that Apps wont work. I had that with TuneIn not connecting. After disconnecting the battery for 2min. everything worked like intended.
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XC90 AWD D5 Momentum
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