Thanks for your input Akria. I don't know why it attempts to reconnect to 
wireless as it is connected permanently to broadband via ethernet cable. And I 
notice when I click on the icon (installed on the top toolbar) for signing in 
to hotmail, the screens shakes slightly and a flash of a green line appears 
around the edges - at its worst this has appeared as a series of green line 
boxes, but that hasn't happened for awhile.
I will wait to hear back before creating a new bug report.

-- 
screen freezes after working for awhile but cursor still moves around
https://bugs.launchpad.net/bugs/502055
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