It seems, the issue is not only related to Pixel Camera but the whole device...For instance, it crashes as (sometime) while installing new apps, or installing GOS update. Still Pixel Camera is the app that crashes the device the most.
Weird behaviour, crash occur more often in the afternoon than in the morning, I'm able to use camera for a longer time during the morning that the afternoon, all right, it sounds crazy... But, I think failures happen more often while the device gets hot. So I would go for a hardware issue.
What do you think guys ?