I agree with Krupa about some rounds needing abandoning. I played one a while ago where it was going so poorly and I was not having fun. After 6 holes, I made a difficult goal for the next three holes and if I made the goal, I would continue on and if not I'd stop (I was playing alone as well). Hole 7 was great, Hole 8 was okay and Hole 9 was close. It turned around some, but just fell short of my goal. I was pleased, but wasn't enough and was getting late, so I stopped.
I'm also experiencing what JonMA1 says about a crappy round following a great one. Last week I had the best round ever (93, including a 5 hole par streak) and then the next day I shot a 108. I did break 100 again last night though (98).
Last year I did break it a couple of times, but it was always followed by going to back to the usual score.