Android host. I have several phones, some galaxy S8 Android 7, some J3, Android 6. They were all set up the same. Power saving is off. Eco-mode is on. Some work flawlessly. Then, some of each type are able to establish connections, but cannot show the screen. The remote control screen just says "connecting to [phone_name]". If I look at the dashboard or file transfer, I see that the phone is connected, and I can actually transfer files. If I manually turn the phone on, I get the screenshot and remote control. It just won't start remote control with the screen off. But only for some phones.
The error log has a long list of "screengrab [method name] failed".