Why does the laptop turn off?

Question

System administration

Good afternoon.
Such a problem: The
laptop turns off after about 10-15 minutes after closing the lid. I do not play games, I do not load much. This did not happen before until I reinstalled Windows (the old one flew).

Windows 8.1
Dell Inspiron 5721
UPD: Connected an external monitor and noticed that every time I close the lid it gives this error:

Answer 1

Task:
Given: nothing
Find: all
Answer: due to a very meager data set, bsodstop.ru/0x0000007e-system-thread-exception-not...
In general, I would look at bsodviewer or somehow memory.dmp
Looks like on the curve driver

Answer 2

This is from the inability to use the search

Answer 3

See what happens when you close the lid.
Control Panel->System and Security->Power Options->Lid Close Action