Hi, this is happening to my roku too. It loaded fine about 10 days ago, but today it will not load.
Model: 7133X - Roku RV
TCL model: 65S423
Serial number: YNOOWN314612
Device ID: J6988W314612
Software version: 10.5.0 • build 4210-30
Problem occurs when trying to load HBOMax only.
Tracker ID: 12-062-251
To reproduce the issue, start the device, select HBOMax, wait. It momentarily shows the HBOMax logo, then shows three white dots blinking on a black screen. Finally it returns to the main menu.
I've tried uninstalling and restarting in various combinations and it still is not loading.