It's happened to me here last 3 nights in a row at various times. I open a new window and go look at CNN or MSNBC for a bit and then toggle back to lawnsite, it takes that long for it to "clear up" the problem to get back to the site.
I find it happens with me around 7-9:00 pm eastern time. I bet LOTS of us are on then as if it's 9:00 ET, it's 8:00, 7:00 and 6:00 across the country... Everyone's home either eating, done eating, and it's dark out. Nothing to do. <G>
I've found when I go on here at 7:00 AM, it's 6:00, 5:00 and 4:00 in the other time zones in the morning and there is like NO-one else on and it's real fast..