This is just an educated guess, butI got 3 back to back PLL skips on the 4x4. (not forced) Whats the chance of that happening? cause you gotta include pairity right
Chance of PLL skip on 3x3 is 1/72.
Parity is 1/2.
Chance of PLL skip on 4x4 should be 1/144.
1/144 * 1/144 * 1/144 = 1/2,985,984
It makes sense but knowing me it's probably wrong.