Like Timby's post
Phone ringing/someone coming to my door during a session is neg EV.
You could try playing a strategy video(one of Trikkurs or whatever) in the background as a motivator to keep yourself thinking on the right wavelength.
Nawhead, also, you have interesting insight into the theory/tactics that we can see in the forums. So that's the hard part. You just have the easier part to deal with, grinding.
When you are running hot, does this 1 hour thing still happen?