Thermaltake View 71 RGB Fans go dark after while

[WhiteBoxWB 0]

Not sure if this is some kind built in feature or something that i need to change in my mainboard settings. Here is what is happening, when i turn on my pc the included 3 RGB fans shine bright after while haven't had change to time but lets say 5 minutes all 3 would dim they do not turn off light completely but they dim.

Has anyone see this same behavior or is there something that i can do to change this?

[Tt Leo 66]

Hi
would you provide your MB model? we think it's more like energy saving setting.
if you restart the computer again, would the brightness maintain at first 5 mins?

we suggest you to try another USB pin head on the MB.

if you still have problems, please contact us at FAE@thermaltake.com
thank you!