Radio goes of

[Ppppp]

My 2017 e class e220d coupe, had to have a new battery 3 months ago, since it’s been fitted, upto now it’s happened 3 times were the dab radio goes of and it says device unavalable, and no matter what I do, it won’t come on, but if I leave it for an hour” and I jump in the car, and start the car, the radio comes back on, anyway I’ve booked it in at Mercedes we’re the battery was fitted for this Thursday. they said on the phone the softwear might just need updating. Il let you now what they say. As the warrenty runs out on friday.