why my cpu stuck at 2.96 ghz, even doing nothing, its frustrating

Please tell us some basic information before asking for help:
- Model Name:
- Firmware Version:
- Rooted or not:
- Frequency of Occurrence:
- APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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Comments
I suggest you force close all apps and then restart your phone. If you're still experiencing that the CPU is working at max, then it must be a service which is using its full performance and the easiest way to find out which one is by logging your device.
That's the bad .49 update, download the new one. Probs download new one from rog site.
I was facing the same issue. Factory reset worked for me.
How do you go about logging your phone to see what apps are using cpu
Enabling Developer Options
If you don't have developer options, do the following:
XDA has a nice guide in doing the installation:
After performing the installation steps, type in: ./adb.exe shell top
This will show you the usage of cpu ordered by the highest first.