This just started for me this week, too. Same 20,000 "rotation######.tmp" files on the sd card, which bogged down the directories. CleanMaster took 20 minutes instead of 45 seconds. No, I don't have AllShare or Kiwi Run.
The first 13,000 I deleted were dated 6/15-6/17. 'Problem solved,' I thought. Nope, my file manager apps still chugged for 20 minutes.
Few hours later, I found another few thousand files, dated 6/16-6/19, many created at times of the day when I was asleep, many created at times prior to my last delete-cleaning. Shrugged and deleted all the newfound files. Still a 20-minute chug.
Desperately trying to avoid a factory reset, I uninstalled the following apps (mostly because CleanMaster seemed to be lingering on their names):
* Outlook (which I just installed last week, one of two apps I've installed [or even manually updated] in the past three months [I uninstalled #2 a few days ago])
* OfficeSuite
* Yahoo Mail
* Twitter
* Coach Memory (a game)
Afterwards, I found and deleted another 20,000 .tmp files.
...AND THE 20-MINUTE CHUG IS FINALLY GONE.
From ALL my file managers.
FINALLY.
I'm optimistic that uninstalling one of those apps fixed the problem, but I'll wait to be certain; if I wake up tomorrow and find another 20,000 tmp files, I will update here. In the meantime... of the apps I listed, do we have any in common?
(I can't open the villainous tmp files. Probably just me. Someone smart could do it.)
(I also have an older Sony, running 4.0.4... do older Sonys just have an expiration date of mid-June 2016? Why'd we all get this just now?)