Does the computer how always halt?

Does my computer how always halt? Has the server.Sometimes also was very the card, too hot?
Inside the engine case the dust were too many easily also to cause to halt Cleans up the engine case, and the card and so on above ash cleaning up is obviously clean the motherboard, has the engine case ventilator?
Best Canadian, has come in the summer, the temperature high will have such situation The disposition is also related