If your isp is changing your IP every two hours, there's a severe bug with your router or their config, not the game - pretty much every mmo these days using this kind of verification system (tho several offer options to turn it off).
Most every isp using dynamic IPs these days, but in general as long as you don't power down your modem, they shouldn't change more then once a week.
Especially not every 2 hours, thats short of a lease is just not normal. It would caues unneccesary addition load on your isp to do that. (and even renewing the lease shouldn't change you IP anyways)
Check your modem/router config. Somtimes you can increase your dhcp lease time yourself. (tho manys isps lock it down, mine does since its fiberop and can renew nearly instantly anyways)
Personally had the same IP for months now, and my isp uses dynamic IPs too.