If the min CPU freq changed by itself it could be due to MpDecision (the min CPU freq is increased for smoothness purpose when you touch the screen so when you open Trickster Mod for example for xx ms... plus the specific refresh time of the app to see the real min CPU freq), for the max CPU freq maybe due to thermal throttling at some point (the CPU freq is decreased according to the CPU temperature to avoid damages)...
What is the min CPU freq when it's changed? 1.26 Ghz?
What is the max CPU freq when it's changed? In what situations?