high end laptop working like a low end laptop

[Hamed_purehashemi]

hello everybody. around 1 year ago I bought a gaming asus laptop it was working really fine but just about 2 month ago it started to work like a low end laptop. I mean when I press the auto detect option in games, the game will detect my hardware as low end and it put all settings on low. and also I used to get 60 fps on very high settings in almost all games but now I don't even get 20 fps on low setting. my specs are:
ram: 16 Gb
CPU: core I 7
GPU: GTX 960m 4 Gb
OS: win 10
HDD: 1 Tb
pls help me. things are making me so much angry my last low end pc was much more better than this.

 

[EchohcE]

Check to see if you had any windows or driver updates around the time your performance tanked.

 

[rgd1101]

Running the same games or newer games?
What is the exact Asus model?

 

[Hamed_purehashemi]

Running the same games or newer games?
What is the exact Asus model?

the same and the new games all of them doing the same thing. none of my games detect my real hardware. One of my new games is watch dogs 2, I've read the comments about this game in steam, people were saying that they can play this game on the worst specs on atleast on low with 60 fps but I cant even play it on low with 20 fps. and also the division or rainbow six. if you say these are new, so I've also tried this on the elder scrolls v skyrim, even on this old game I've the same problem. the laptop model is:
Asus R.O.G G551j

 

[Hamed_purehashemi]

Check to see if you had any windows or driver updates around the time your performance tanked.

I've checked this before. there is no application or driver which is being updated during my gaming time.

 

[EchohcE]

You misread my suggestion. I'm saying go back through the logs to see what was installed 2 months ago around the time the performance changed.