The first one I order a few months back was hanging/crashing for no known reason about once per week.  I tried everything to figure out what was happening.  Looked all over the internet, tried a dozen or more suggestion, some extremely techy, and getting into BIOS, and registry.  Nothing worked.  Finally had to send it back.  They stood behind there product, no issues.  Received a replacement within two weeks.  Very satisfied with the customer service and reputability.