Yes we have seen problems with KDE Neon, problems we don't reproduce when standard Ubuntu 16.04 is used on the same machine.
We have seen the immediate logouts - are you seeing segfaults in dmesg perhaps?
Would you be able to attach logs captured from your device? Maybe it would be possible to find out what's causing the general slowness. See the sticky thread for a link to support tool.
Thanks,
Michal
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