Sony Xperia ZR overheating after upgrade to 10.3.1.A.2.67 solution

If you experience overheating of the Sony Xperia ZR phone after upgrading the system to 10.3.1.A.2.67, you can reduce this by disabling NFC. The overheating was due to NFC being switched on by default after the upgrade. Apparently, the upgrade leaves it on after you power on the phone.