No, I haven't tinkered with the cache here. I did notice it was happening to another site of mine, suggesting it was a problem with the server. My last host was fine as far as speed goes, but I just wanted to go to a more economical option. My current host was fine up until that glitch a couple of weeks ago. Now, it seems to have worked itself out and I'm getting the speed that we had initially. Let's hope it's permanently fixed.