Misfiring while accelerating.... still

[Badasblkbmwx5]

Hello guys just picked up my X5 E70 gas 3.5 xdrive from dealership for repair of misfiring while accelerating . Dealership stated my vehicle was repaired and the cause was from a bad turbo boost sensor. The plugs have less than 300 miles on them. Engine malfunction light has been fixed. I was thinking a bad coil pack?
Now 4 days later, same misfire under acceleration. I was just notified now that the issue is a transfer box issue.
Last fall my X5 was in the shop for 3 weeks for the mechatronic box bmw zf transmission malfunction. Anyone else have this issue regarding transfer box case needing repair??

Thank God for my extended warranty! I had asked earlier about extended warranty policy recommendations??