Maybe it's time for AIS to get themselves a new ISP for their ADSL www hosting service
I have a much better uptime on the www/pop/smtp server at my office, which is running (FreeBSD) on the end of a 256/512 ADSL, has been up for about a year nonstop, and which never falls over despite having gigs of PDFs downloaded from it all the time and being attacked (usually with a scripted dictionary attack) roughly every 10 seconds.
I know AIS have rather more traffic but this is inexcusable. More so given that a pilot can go to jail if he busts something. Even more so if the jail happens to be in, say, Spain....