The performance and Max Temprature both down for Radeon 8750M

First my Laptop's specs


Acer TMP255-MG

4GB Ram

i5-4200U CPU @1.6 Ghz

Windows 10(64bit)

Radeon HD 8750m 2GB

 

 

I was playing Skyrim last night when all of a sudden there was a performance drop. I am using Rivatuner for displaying the temperature,GPU clock speed and FPS on the top left corner of my screen.

 

I quit the game and started it again and now I cant get the performance that I was getting before and the funny things is that previously the normal temperature range for the GPU was 67-69C and now it does not go over 51C and the game now lags,which is did not previously