Laptop shuts down after 5min gaming

[Xfighter]

as the title suggests my acer v3 laptop shuts down after 5min of offline gaming.
tested and happens when playing skyrim and blackflag.
back half a year ago when i got the laptop i could play skyrim for hours without problems.
i have a i7-4702mq, gtx760m, 8gb ram and use win8,1.
nvidia is up to date.

 

[Xfighter]

some extra info: it just turns off without notification and i assume its the gpu that turns off

 

[Xfighter]

where can i find out the temp of my cpu/gpu?

 

[Perfectjake]

To get temperatures download Piriform's Speccy.

Also if you are seeing a blue screen, note the stop code it will be a long code starting with 0x with more 0s and a number at the end, note down the last 2 digits. This is helpful for tracking down the issue.

 

[Xfighter]

ok, ill have a look and post the results tomorrow. i dont get a blue screen. its an instant turnoff without windows shutting down.

 

[Xfighter]

so before i started running furmark i went into the garage and blew some air into fan of the gpu cooler using a compressor, i didnt expect the problems to be due to dust in the cooler after owning this laptop for 6 months, and i have to say not much came out, but seems like it was enough to cause my gpu to heat up enough to shut down