I doubt av software is an issue, generally when it is the effect on the speed test is not so random.
Some other Uno user tests
http://www.thinkbroadband.com/speedtest/results.html... - the shape of the tests is perfect in this case.
http://www.thinkbroadband.com/speedtest/results.html... - here is a not so good one, notice the poor latency too suggesting something up with their connection.
http://www.thinkbroadband.com/speedtest/results.html... - another good graph showing that even when connections are not hitting maximum possible speed due to distance you should not see a wobbly messy looking bandwidth chart



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RobertoS