Encryption issue with Xperia Z2 - hangs intermittently - anyone come across this?

Hi all,
I'm on my second Z2, having returned my first for what I thought at the time may have been a hardware issue.
Basically the device intermittenlyhangs and the screen cannot be switched on with the power button on the side. It needs a reboot via the Power and Volume up buttons. I can reliably reproduce the hang by downloading one of the 6 free movies to my SD card, but it also happens intermittetly when I'm not using the phone. If it hangs during download, the charge rapidly drops (eg from 100% to 69% within 30 minutes) and the unit gets very hot.
I bellieve I've isolated this issue to enabling encryption for the device and SD card. Without these options enablied the device is rock solid. I have reproduced the issue on my replacement. phone. No apps other than those supplied out the box were installed at the time. Having subsequently removed encryption - a huge pain as it meant a factory reset , reformat of my SD card and re-download of the movies due to the DRM - the phone is rock solid once again.
Encryption is a standard feature of Android, which I've been using on my previous Samsung Galaxy S3 and S4 with no problems whatsoever, so this is quite worrying if it is a bug. On a non related note - I disovered also that the backup application does not work if encryption is enabled.
Just wondering whether any other Z2 users on the forum have come across this issue so far?

Hi again,
Just posting a follow up.
I've done some testing and I seem to have narrowed the problem down to the use of the Sony Movies application with encryption enabled on the Z2.
If I launch the Movies application and start a download of one of the 6 free movies, and leave the phone alone, then it eventually hangs as I've described in my OP. If I press the Power button shortly after the hang happens the screen does not switch. If I hold the power button down the Z2 spontaneously reboots If however the phone has been in the hang state for a while then it can only be recovered by using the Power and Volume+ buttons.
The hang also occurs if I launch the Movies application and leave it running in the background. The phone eventually goes into the hang state. The battery charge rapidly drains down during the time the phone is in the hang state, losing 30% or more charge in a short time.
If I do not launch the Movies application then the phone appears stable with encryption enabled. If I do not enable encryption then the phone is rock solid. This behaviour has occured on my original Z2 and on the replacemement that my mobile operator sent me, as I orginally thought my first unit had a hardware problem.
I've sent a description of the issue to Sony via the "Contact us" link on Xperia Care Support. Hopefully this will be addressed.

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