OS sometime crash without alert ,

[taitran.apps]

HI everyone,

My Mac 15 inch (MC721) sometime crash after I upgrade it to 10.10 and I don't know why , mostly when I play musics or videos. It annoys me so much. This phenomenon never happens in previous OS version (10.9, 10.8).
Everything 's ok after I manually restart it but this problem still happen repeatedly. Does anyone has this problem?

 

[grahamperrin]

Console is our friend

When the problem recurs, make a written note of the date and time.

After the next start of the Mac, take a Console view of all messages.

Some of the messages will be technobabble, but from around the time of the problem you will probably find something that's relevant. If you like, paste a selection of those messages here.