Model: Pi 4 Model B Rev 1.2 OS: Linux raspberrypi 4.19.97 I've had my Pi up and running for a couple weeks (on a monitor, not TV). It started, and has been displaying, in 1920x1080 resolution. I've rebooted several times and it always came up 1920x1080. Today, however, it booted to 1024x768 and I ca...