Hey chaps   
I am having an issue with my system. Once it’s loading into a multiplayer game the computer will shut down and restart. After it restarts it usually runs ok. It’s only with multiplayer. Sometimes I’ll even get as far as starting the jet but without fail it’ll shut down then restart. It happens with 2.5 and 2.5.6 open.   
Any ideas what it could be?   
I’ve replaced the power supply, gpu, ram and even the board and cpu.   
System specs: 
I5 2500k 
8gb hyperx fury - I also tried some other 8gb ram and together at 16gb 
Msi gtx 970 
Corsair cx750m psu     
Edit: sorry if this isn’t the right place for this