I take breaks from time to time, nothing to do with burnout, but more to do with boredom with the lack of courses.
Yes selection has improved, when I first found this game it was CTTH only, left and re-fund it a couple of years later.
I find most players who burnout play a huge amount and usually will be the ones that play for credits, hence frustration when variances kick in. Personally I am here purely for the enjoyment and like Lee, can be happy with starters and the free ball and can't see the point of playing for credits as there is no real tangible reward.
If a game stresses you out that much, yes take a break, clear your head and perhaps you may find it can be an enjoyable game again when you come back.