Don't mean to be a party pooper (Heh sorry), but....
If we weren't supposed to sit humans would never have evolved buttocks.
Wish scientists would focus their attention on matters far more important, than how we're supposed to defecate.
What i would do first is disable lanes 2 and 3, running gpu 1 only. Boot up, then shutdown. Then enable the lanes again and boot up. This may work since it sounds like a config glitch, happened to me before a few times.