After my venu 3 updated to 9.xx softwares, watch started to randomly go to AOD mode. It is normally disabled for everything and I don't use AOD.
After the 10.20 update, I started to notice it happening more often. According to my testing, seems like it happens when I check the watch and do not rotate my wrist all the way back so watch face stays open. Then it goes to AOD mode.
It doesn't happen if I rotate my wrist back enough to turn the watch face off.
Here is the youtube video link of my problem;