Mine is mental. I let the most annoying things get to me. Yesterday I played 18, on 15 holes I was 2 over. on the other 3 holes I was 9 over (double, triple, quad). The triple and quad came on back to back holes. The hits are all duffs, toed into the woods, pull/push putts, and pulling my head on chips. Im very competitive to a fault so when Im playing by myself I can forget sometimes to just enjoy it and instead play too hard against myself. Im working on it and its gone from 7-8 bad holes to 3-4 bad holes. The goal is to make it 1 or none bad holes.