Not according to Apple. Still have 19 days on the warranty so will assess it over the next few days and go back to them if needs be.
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Have written to their support and they reel off the same advice:
- hard restart the phone
- reinstall impacted apps
- reset settings
- factory reset phone and restore from backup
I'm on the 4th step so fingers crossed it works.
Have you followed their advice or just ignored it? I've had issues resolved by a clean install.
edit:
mis-read, i guess you're on that step, step 4.... i've had success with that in the past.