I’m using my Android tablet (Tab S7+) as a second touchscreen monitor by USB via a 25ft active USB extender to a USB-C cable to connect the PC to the tablet. The issue happens when I start sending touch inputs to the host computer: it disconnects after ~15 seconds. If I don’t, the connection stays flawless. Please also note that my tablet starts charging when I connect the cable, which might “steal” the active USB extender’s power and causing it to cut off the connection. Needless to say, I would rather not root my device to disable charging just to test that theory.
I’ve attached a diagram of my setup.
All cables are USB 3.0 but they were the cheapest on Amazon (they were still relatively expensive).
Have you tried connecting your tablet directly to your PC without the USB extender? is the issue still happening using that setup?
there is a similar bug present in the old spacedesk viewer app. Please make sure that your app is updated to the latest version 0.91.10 in the playstore.
BTW: charging your phone while using spacedesk via USB cable at the same time should not affect its connection.