Could be they're bouncing people like me off. I'm hosting a couple of domains on my PC at home, and my ISP officially doesn't allow web serving and FTP serving from residential accounts. I get away with it because traffic is low, and my IP address hasn't changed since September. However, if they reboot their servers, I end up with a new IP address and have to change my domain registry and httpd.conf files. This may be a pre-emptive strike against users like me who host a couple of small personal sites for experimentation and learning, yet can't afford $400+ per month per domain for dedicated business accounts. There should be no technical need for them to reboot every day.