I would like to know this too, BUMP!

SOLVED IT! Here, You can use this, hope it helps out! UNITV2 WEB RESULT RESPONSE

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...

I reboot with terminal and try LaneLine Tracker setting. but I had same problem... I try it: Power on and start UnitV2 . Click gear icon and select "Switch to notebook mode". Open Jupyter main page. Click "New" and select "Terminal". type "reboot" and open camera stream page. Click little switch and there color change black to light blue. Select "LaneLine Tracker" on Browser GUI. Change L_max text box value 0 to 30 . Click “update” button. Line tracking process is stopped. but camera stream keep running. Maybe, I think my unitV2 need initialize firmware. Where is unitv2 initialize procedure?

@m5stack This is a very big issue, The M5Stack team needs to get this working, and the wifi access point!

A new version of the firmware is comming soon ... https://community.m5stack.com/topic/3321/unit-v2-connection