If it's any consolation, you're not alone. I have had the same problem since the dreaded "upgrade". It is intermittent. And sometime switching between the various servers helps, but not alwa ...
I had the same problem about 3 weeks ago. In that case it was replying to someone who had put "lottery" in the subject of their email, so I had not even put the word in myself.
I have similar problems with Belkin 7632. Initially also had problems with Speedtouch 30 dropping out every half hour or so, but that does seem to be cured ( brave words ...
An earlier post offered this as a speed tester. It consistently fails to run on my link, saying there is an error. Can anyone confirm it should work on Wanadoo? I have a line / network fault I am tryi ...