I’ve recently built up a newly bought 10" Picade with a 4Gb RPI4.
Having got Retropie up and running I noticed at times the screen would drop out, coming back with the HDMI message at the top left. Lowering the sound volume reduced the incidence. I wondered if the power supply on the Xhat was browning out. In the first trials I had a small wired keyboard and a 32Gb USB stick plugged into the RPI USB ports.
Later trials with nothing extra plugged into the USB ports didn’t suffer the same problems of screen dropout.
How much margin is there on the supply to 10" Picade with an RPI4?