Let’s see…. I don’t think I can remember all of them, but there really was no pattern that I could discern.
The first time it happened was about 1 hour in, right after getting scratched by the jade cat. When the clock turned over to nighttime and I was walking though the central room of them temple to get back to bed, the game locked up.
The second time was in the village, after I had gotten the quest to get Ziba’s flower, grabbed the flower, and returned it (unfortunately, all without saving, which I imagine was partially to blame for my knowing that Ziba was a florist but not being able to select the relevant option, haha). Strangely, this one occurred not during gameplay, but when I left the game on pause for a while. IIRC, I was on the journal screen at the time, in the town.
The other three times it happened stand out less in my mind since I didn’t lose much progress as a result, since I was saving very frequently after the incident with the flower.
I do remember that one of them happened on the day that the old guy’s story event took place, but beyond that, I don’t have many details for that one.
Another, I do remember that the clock turned over into dusk right before, but I don’t recall where I was.
Interestingly though, I can say with confidence that once I was past the ~3 hour mark, I didn’t experience this again.