Up here, during the heat of the summer when the temperature hits 100+ degrees and the humidity is godawful, we have 'brown outs.' They usually occur between 4 and 7 pm when people are getting home from work and cutting on the a/c and other appliances. The first time it happened at home, I thought our a/c died. At work, they were kind enough to warn us so we didn't lose data. The power companies didn't announce it; they just throttled power so the grid wouldn't overload. I'm not sure if the power companies in Texas are allowed to do it, but this could possibly be a cause of your problem.
