Project 1999 - Macbook shuts down while playing Everquest

Hi,

Yesterday I installed project 1999 on my macbook using the instructions provided on this website. I got to level 10 and this morning when I logged in, I was able to play for 5 minutes before my computer shut down. The upon restarting it would shut down upon opening the wine skin. I waited 10 or so minutes and was able to login and play for another minute before it shut down. I was wondering if anyone had experienced this before and could help me out. I do not have shutdown problems in any other game.