That sucks !! I used to have that problem till the new server - have you run virus scans and spybot ?? Back when I had some issues I found out it was my computer.....the scans I did were these
my Norton -
then I did these scans - what one missed another found
Trendmicro Online scan - FREE online only - no download
Kaskersky Scan - FREE - online only - no download
spy Bot - FREE - download
after hours of scanning I found 4 things in my computer and have had no problems since...you may want to do a trial of Anti-Malware too - I used something called A-Squared
http://www.emsisoft.com/en/software/free/and it worked really good too