adw: Thanks, will be interested if you can pin anything down. Do you know what server the site you're having problems with is on please?
I seem to be having the problem on one site more than the others, but it's a bit hard to tell as I don't constantly visit every site in order to check that it's still up and running (although I did do that yesterday afternoon and all of them were working ok).
My main problem site is on ww2.iserve.net.nz but I've got lots of other sites on this server and they can be working when the problem one isn't.
I've been with iServe for quite a few years and before being bought by Orcon I found them to be very reliable and to offer fantastic service. I personally met with the original iServe management team and found them to be very open and accommodating. It was because of this that I purchased their LifePlan Plus package back in 2006 which means that for a one-off payment I never have to pay them for hosting ever again. This has paid for itself several times over and I'm very glad that I made that decision.
I've looked into hosting via Amazon's EC2 but so far I haven't gone down that root because my Linux sys admin skills aren't all that hot (I do use Amazon's S3 service though and always chuckle when they bill me 50 cents a month for the gigabytes of storage I've used).
So I don't think I'll be jumping ship just yet, although the longer this continues the more concerned I'm getting.
BTW: has anyone pointed iServe to this discussion so they can see it's affecting more than one customer?