I didn't get anywhere setting GPIO1 however I downloaded UIFlow v3.0 from https://docs.m5stack.com/en/download and uploaded the latest version v1.10.1 to my Core Ink and now I have working Restart and Power On / Off :-)

Thanks Felix - I'll give that a try and report back...

I'm trying to write a simple UIFlow program to put my CoreInk to sleep for 30 seconds then wake up and display something new on the screen. I've tried "Power:Restart after seconds" and even a "Power:Shutdown" but neither appear to work (running on battery, no usb power). Has anyone managed to get sleep/wake to work using UIFlow/MicroPython (v1.9.8)?

My new UnitV2 was overheating and shutting down as well during object detection. Running sudo cat /sys/devices/system/cpu/cpufreq/temp_out I could see the temperature consistently above 90 and and like you it only lasted for 5 mins before shutting down. I took the back off the unit and saw that the fan was oriented incorrectly - the fan output should point upwards so the air flows over the heatsink; mine was venting sideways! After re-orienting correctly the temperature stays around 70 degrees and no shutdowns :-). I hope this helps...