Same here on both Roku Sticks for the last day; but it’s intermittent. After rebooting and launching YouTube it’ll keep freezing and rebooting at black screen and then suddenly it will work after random number of tries.
both of mine are:
Model 3600X - Roku Stick
software: 9.4.0 build 4200-24
Roku 3, Roku Stick, Roku Stick, Apple TV, TCL Roku TV