on 27-06-2019 11:58
Use Apple care to check (and hopefully replace) the phone.
Please note, this is not customer services and we cannot access your account. Do not publish personal details (email, phone number, bank account).
Link to our guide on how to contact them can be found here
on 02-07-2019 08:52
I've been into the Apple Store and they confirmed this is 'normal' behaviour