I have a Dell Precision 380 and it will work for awhile and then it goes into power save mode? The screen goes black and it appears that the PC is still on but nothing works. It is located in a warehouse that gets a little warm. Confusing because when I bring it into my office, it works fine. Hooked up another PC to the location in the warehouse and it works fine so it's not the wiring. Could it be a heat issue or the fans not working properly? It's under warranty but I have received no help from Dell's tech support. Any help would be great. Thanks in advance.