I have the same impression, but do you know this for sure? I haven't looked at any stats, but it'd be interesting to know. Not just each player's +/- over the last 6 games, but who was on the floor during scoring runs in particular.
SMALL SAMPLE SIZE WARNING. USE AS DESCRIPTION OF WHAT HAPPENED, NOT WHAT "IS" OR "WILL BE".
By RAPM over the past 6 games it goes:
Clingan - 7.2
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Hawkins - 4.9
Jackson - 3.9
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Diarra - 2.5
Calcaterra - 1.5
Karaban - 1.2
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Sanogo - 0.3
Newton - (-0.5)
Alleyne - (-1.6)
Of the 5 most used lineups during this 6 game stretch, the worst has been the starting lineup with Diarra in for Newton. The next worst has been the regular starting lineup. Both are for the same reason. The defense has been atrocious. 1.22 and 1.31 points per possession against. Allowing 62% and 60% from 2pt. The Diarra lineup fouled a ton, the starting lineup is letting a lot of guys get to rim (bad) and to hit a % on their midrange jumpers (unlucky).
The 2 best lineups have been the starting lineup with Clingan in place of Sanogo and then a Diarra/Calcaterra/Hawkins/Karaban/Sanogo lineup which has actually been the best but used exclusively against Creighton and St. Johns. The Clingan lineup is protecting the rim and hitting the offensive boards, but struggling in the paint offensively. The Sanogo lineup has been a scoring machine and generally just outscoring teams (they're giving up a lot at the rim and at FT line).
As far as timing of runs goes, my best recollection would say that it is most often when opponent has a couple backups in and we have Clingan in (with like 10-5 min left in 1st half).