I use a One Spot too, all eight connectors used and haven't had any problems so far. At 1.7A, they take some beating, especially at this price point.
There are many other more expensive power supplies out there, some with isolated outputs for each pedal, but even then, few achieve a total output of 1700mA...and the One Spot itself may not be the problem.
The first thing I would try is removing the least-used pedal from the board, see if that solves the problem, if so, you only have to buy another regulated power supply for one pedal...a far cheaper option than a DC Brick or Voodoo Lab unit.
If that doesn't do it, I'd order another daisy chain lead...it might be a bad connection in one of the power jacks.
Hope this helps.
Misinformation isn't all it's cracked up to be