For some reason the main screen on my 2018 MacBook Pro (2.9Ghz, 32GB RAM, 2TB HD) goes to sleep and won't wake up. I'm connected to a Razer Core X eGPU with an AMD Vega 56, and Dell monitor (which wakes up fine). It all works great, but after awhile, the main screen goes to sleep and I can't figure out how to wake it up. The system thinks there's still a screen there, but it doesn't work. Anyone else run into this issue?