I now found out, there is an issue with Raven Ridge and suspending STR. The CPU tends to freeze.
It was said having been patched in kernel 4.14.
Though, my machine still freezes with kernel 4.15.6.......
same here, it used to suspend before, after so many updates and tries to stop the freezes it doesn't anymore... using archlinux here
Can confirm the same on kernel 4.17 on Ubuntu.
Also it occasionally freezes (today, I managed 5 hours without freezing) - I run fairly intensive loads, - various instances of IDEs, docker etc.