Hi there and welcome
When you did the factory reset, did it wipe off all your data and return the phone to new?
Thanks, ***** ***** mislead you here as then the problem is very clear
It is the internal memory that has faulted.
A corrupted firmware can cause this. But we have ruled this out by reinstallig it via the factory reset.
I am really sorry about this and you are going to have to return the phone to have it replaced. It will be covered by the warranty if this has not expired, and the replacement will be done at no cost to you.
I am really sorry about this, and if you have problems, or would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service by clicking one of the stars at the top of the page, then submit, that would be greatly appreciated.