When sight-reading, I always stress to my students: don't stop and restart!
It's as if you are playing with an invisible band. They won't stop for you so you must learn to keep the beat going. If you stumble, pick things back up as if the beat never stopped (which it doesn't!).
This reminds me of that classic sketch from the comedy, I Love Lucy, when Lucy and Ethel get a job wrapping candies as they come off the conveyer belt. All those little candies might being to feel like notes in a tricky sight-reading passage.
The belt never stops...keep going!