Does it do it *every* half hour, at exactly the same interval, or approximately every half hour?
I'd say it's almost definately a problem with their service if it's always the same interval,a d it definately demonstrates the same behavior regardless of the hardware used (you sid he'd tried multiple different hardware setups).
From what you described, it sounds,though, more like it does it intermittantly (since it didn't do it while the technician was there). If that's the case, I'd take a look at the line (in the home, presumably). If it's old wire, that could contribute to the problem, as could lack of microfilters (like he already siad).
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