What OP tells here, is that it is his client that crashes and just closes. So - for me, it sounds like a process that kills the client. It can be sound or graphics. Therefore it should be provided more info about his system, and when it happends.
- this is not a server side issue, but a client side issue. If he runs ec or cc, its different requirements from the local computer. It is also different solutions on different systems, from XP, W7 and W8.
- what he could do, is to update the graphic card driver and sound card driver.