I just bought an Asus FX505DY, had just a few days. It has an RX 560X installed but every few minutes if the computer sits idle the GPU will up and disappear from every window I can think to find it on, including the Device Manager, Task Manager, the Radeon Setting panel, and even DxDiag.
The drivers are fully up to date. Power management and being plugged in or unplugged don't seem to matter. Any help or advice would be appreciated.