OK, this is the reply I got from Samsung:
"Thank you for contacting Samsung.
I am sorry to hear of the issue you are experiencing with your Galaxy
Note 3. I understand how frustrating this can be as the device cost a
lot of money.
Please be advised this is not a known issue to Samsung. If you feel
there is an issue with the device you can get it assessed at one of our
service centres and get the issue resolved.
We have walk-in service centres all over the country that can give
assistance and perform minor repairs while you wait. Just bring your
device, with the proof of purchase to confirm your warranty, and one of
our qualified technicians will be happy to help. Please note we advise
backing up any important files on your device due to possible removal
We recommend calling the walk-in centre before making any travel plans
to ensure a more convenient service. If you would like to check for
service centres by postcode, please click on the link below and choose
‘Mobile Phones’ from the drop down menu:
Please note if your device is out of warranty, or if any defect found is
not covered by the terms of our warranty, there may be a charge for any
service or repairs carried out.
If this is inconvenient for you, please provide the following
information so we can get your device booked in for repair and get a j
iffy bag sent out to you:
1) IMEI number (also located underneath the battery)
2) Your current network provider
3) A brief description of the issue
You should receive the pre-paid jiffy bag from the service centre within
3-5 working days of the service request being created.
Once we have this information we can proceed with the service request
and provide you with further instructions.
If you require any further assistance, please contact Samsung again and
we will be more than happy to help.
Online Support Team
SAMSUNG Customer Support Centre"