In short, your games per hour are too high.
If you were to drop it to 1 second wait time and T1, you would start to notice it much sooner and more often.
My experience:
0-45 games per hour: Never get 42002
45-55 games per hour: 42002 maybe 1-2 times per week
55+ games per hour: daily 42002 errors.
When I want to truly AFK my game and not have to check on it for days at a time, then I raise my game wait time to 15-35 seconds. Over the course of an hour it keeps me around 50 games per hour. I never get 42002 anymore.
If you want a true daily AFKable experience, get Job's loot rules (They are easy to modify if you don't like defaults). I usually check in on the bot like 2-3 times a week, sort the legs in stash, set the bot again and go away. I was never able to do this at 60gph, or 55 for that matter. I need the game to run unhindered for 60-80 hours at a time with no interruption.