I think I am on my 5th or so attempt at completing a first draft.
Unfortunately, I have usually started over. But then, before, I used to have to read a couple pages before my leave-off point to pick up and write. This go-round, things are flowing more smoothly, to the point that I read a single paragraph before and know what I'm up to.
I am also mapping character details on a separate page to try and avoid conflicting details. It's been helpful.
I have left off all over, between 10K and 60K. I'm around 7K on the new draft now.