Yeah I have been seeing a lot of those as well but it has not seem to be effecting mining to much now that I figured out the issue with my low estimated hash rate. When I was on the EU server it did not seem that it was paying out properly but it may have just been the increase in the number of miners on that are using middlecoin, but I have been mining on the US server for the last day or so and even with the interrupts the pay outs seem to be close to what they were before the increase in miners.