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0e1f616
(Get the code!)
I also experience this problem since I updated yesterday.
I am using Kubuntu 16.04 with KDE backports enabled.
I also have a Ryzen 1800X and an Asrock X370 Gaming professional
I experience this either when I boot and don't log in promptly or when I enter the lockscreen.
After reading this page I tried to run
seq 1 | xargs -P0 -n1 md5sum /dev/zero &
as root to always keep one CPU core busy and indeed this seems to prevent the lockscreen problem...
I would also like to note that the system was not 100% frozen, once every few minutes it seemed to response for a short time, enabling me to switch to the TTY. Then I always saw some processes hanging at 100% that I could not kill, or the kill was delayed for a long time. I always see the errors in the initial posts during that time. The TTY seemes to work fine though, once entered though.