I hear a lot about Google stopping automated queries but I get the same error message when I do manual queries. As soon as I use more than one operator (e.g intitle, intext, etc) in a combined query, I get blocked after only 3 or 4 queries. Google obviously thinks its automated but it's not. I don't use automated scripts etc. It's all by hand.
Is there any way to avoid this or a way around it?