Dice physics experiment: why do many dice cause infinite jitters?

Hey,
I was just simulating dice throws (into a walled off area) for fun and I noticed that 3-4 were fine but anything above caused them all to jitter non-stop. So I turned up the sleep number and now they jitter less but tend to glide on the ground without stopping.

Does anyone have any insight as to what’s going on with the jittering?

Thanks!

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