I put it down to four key things: injuries, the halves pairing, gameplan/combinations and form.
The start of the season (first 6 games) these all seemed to be going well aside from the players still recovering from injury. Then we hit the 6 game losing streak, during that
period all four of those reasons mentioned were prominent:
Injuries: The lineup changed multiple times over the 6 games, Anderson and Ropati returning at the beginning. Hohaia, Wiki and Martin attaining/recovering from injuries as well. The healthy squad also puts heat on players to perform.
Halves Pairing: While it seemed logical to drop Ravs after his form was slumping, Ropati played #6 for 4/6 games, I don't think this was coincidental to the losses.
Gameplan/Combinations: This is the biggest of all the changes I believe, with having a fully fit squad Cleary has been able to throw away some of the combinations he tried during the losing and has found a halves combo (from Ropo and Witt to Witt and Ravs), a hooker rotation (Gatis to Fien, during the slump Gatis only played 3/6 with Ropo and Hohaia filling in the other 3), a center combo (Mannering and Ropo after Hohaia, Byrne and Martin all spent time there during the slump) and settling on a second row by discarding Lawrie and Anderson and pushing Mannering into center where he belongs for now. Also Cleary has seemingly given the all clear to throw offloads, something sorely lacking before.
Form: Lauaki seemed to making the team on promise more than anything during the slump, Wiki was making the team on name only, Mannering was playing below his best, Rovelli wasn't taking the line on and as a result was effectively replaced by Ropo, Vatuvei had the worst game ever and took a few games to recover and (most importantly McKinnon had the suspension to begin the losing, once he returned he was a shadow of who he is now and was at the start of the season.
Credit to Cleary for not throwing everything away or trying something radical, the continuity has helped too I believe.