CAST77 Said:
"Loud sounds and notifications on iPhone: […] Even more strange, had to browse Internet for a moment and answer a text before finishing this answer and it’s working just fine now…?!?[....]"
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So this has been fixed?
If not...
Get this Serviced:
Perhaps this is a Faulty Device?:
You have 14 days to return is. Also, you have a one-year, out-of-the-box, limited-warranty. So, contact Apple Support, asking them if it can be covered.
Contact Apple Support:
Note: Phone calls are taking a bit to go through at the moment, due to lots of calls. With the Coronavirus Pandemic, many are at home at the moment, with much time on their hands to contact Apple. So, just stay on the line, and you will get through :