Most probably network congestion - Can be proved by getting a usable connection very early in the morning or very late at night.
Nothing much you can do other than make your case heard to CS
http://www.o2.co.uk/contactus and report the issue through the My Network app
http://www.o2.co.uk/apps/my-network
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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