If you use WordPress may I ask who your host is? Is it slow? Do you ever notice time outs? I'm with dathorn.com and I more often than not experience time outs when I try to edit/create posts. This is very random and happens throughout the day. Have you experienced this?
Are you using a lot of plugin's/images/ads? This may happen because the preview may take time to load and hence.. timeout!
I have 13 blogs hosted in 1 account www.servage.net Its very speedy and reliable! I also have go daddy, netfirms and dot5hosting. But...i don't really like them. Go daddy is ok but...sometimes they are pain! Try servage.net! Use coupon code - "everythingfree" to get 5 GB extra space.
I host my blog on my own hosting service http://www.littlebluebike.com/ and have no slow downs and none reported by other customers.
I had the same problem some time ago. Ended up being a problem with pinging one of the sites in my list. Removed the offending site and everything went smooth.
A problem with my blogs, or any of my sites. Hosted by me. Want a good host, ask me via PM...do not post here wanting.
do not use godaddy.com.. it is a disaster.. again, do not use godaddy.com.. stay far away.. luckily i only signed up for two months and I can now transfer without losing a bunch of money.. look into hostgator.com