MacBook Pro randomly goes to sleep on Windows 10 (Bootcamp)

Hi,

I have a MacBook Pro (late 2011) running OS X 10.11.4 with Windows 10 installed on Bootcamp partition. Recently, I have noticed that after about 40 minutes of playing games (eg. Call of Duty : Modern Warfare 3), my laptop randomly goes to sleep even if the Power Setting on Windows 10 has been set to "Never" when running on AC power. However, I can wake it up but the problem arises from time to time after those 40 minutes have passed.

System specification :

• Intel Core i7 2760QM processor (2.4 GHz)
• 4 GB RAM
• AMD Radeon HD 6770M graphics processor with 1GB of GDDR5 memory
• Intel HD Graphics 3000 with 384MB of DDR3 SDRAM shared with main memory
• Mac OS : OS X 10.11.4
• Bootcamp (Version 5.1) : Windows 10 Pro Version 1511 Build 10586.164

Has anyone experienced this before? If so, is there is a fix?

Thanks.