Originally Posted by
Stu @ M Developments
That makes perfect sense of course, but doenst in any way explain why it could affect ONLY 1 website.
Most likely there is a bad routing table entry somewhere. Not necessarily the ISP's fault, but their support department is a good place to start. The fact that resetting your router (& thus getting a new IP from them) fixes it does point at it being either within the ISP's network, or VERY close to it.