Yes I have had 24hrs of stable (relatively speaking) runtime.  At least no failovers that I know of.

Looking at the chart, my hashrate seems to jump quite a bit hour to hour which simply doesn't make sense to me.  The reported reject rates on the page is only for the last hour (I do believe, correct me if wrong) so I can't really know if I'm having massively greater rejects during the times reported.  I'm seeing what looks like 1.25-1.75 rates over the last 24hrs which is a significant variance.

My overall 24hr rate is reported as 1.5Mh