Its tough to suss out sometimes without being able to go back and look at a large data set. For us it always feels like 3rd periods tend to have a difference to them compared to 1 and 2...maybe the other team is pushing harder? Maybe my team gets lazy? Maybe its something under the hood? But we've always felt like even if we keep a game close in 1 and 2, it seems to break open in the 3rd. Or may be we just notice it more.
I will say we do have more road games for whatever reason. We continually complain we don't get to try out our new rink or home jersey updates much :)