Looking for advice on this as well.. might be because the level of play isn't engaging enough.
All my matches start like this... 0-4 to start, no footwork or alertness, start to become engaged, lose or win that set 7-5 or 5-7. Get to 5-0 or so in the second set. As expected guy isn't that good and can only push at this point. Lose interest again, tie break usually starts with a large advantage for opponent, tie it up, win or lose by 2..
Never have this issue of being focused or engaged with people I perceive as above my level.