I sometimes have the same problem.
In my case, eaven thow im signed into email with "remember me" and in to "chat", it still times out.
Could it be becouse of my connection, im using UMTS - EDGE modem. However i dont get the same message all the time. Once it is , your ISP is blocking chat or mail. Other times it says only - gmail is having problems with your connection, trying to reconect in ... seconds. And still other times it doesnt say anything, but still does not work. I also get the #008 error many times.