I was doing a H2H search and the game closed because of maintenance.  I understand that they need to perform periodic maintenance, but I'm sure that people dropped LVL drives and H2H matches due to unexpected maintenance.  If Blitz the Elf can tell us about all of his amazing deals, certainly we can get at least a pop-up warning leading up to maintenance.  At the very least, it should be a part of the daily news.