This started happening to me after the second day of running the cooler..., so I checked a few settings in Corsair Link s/w. In the "Configure" dialogue for the H115i Fan, it was (somehow) assigned to the SSD Temp group. I set the Group to H115i Temp, (instead of SSD Temp) and the problem was resolved.
I believe it has to do with the temperature thresholds set in s/w, in which 40 degrees C or higher, boosts the fan, and 39 Degrees or lower slows the fan..., so in my case, the 960EVO SSD hovers at about 39 degrees, jumps to 40, back to 39, etc etc, causing the fans to react in precisely this way. Assigning the Fans to the H115i Temperature Group resolved the erratic fan behavior.
