When might it be better to switch off Adventure Sync?

If you have the app running and you are playing/catching is it better to switch AS off? I have 24hr to get to 50k, on a 1k loop I was catching and got this:

Adventure Sync progress had me up to 39.5k…then I get back and I drink rest of my coffee and 38.4k again. Any theories/ideas about AS while actually actively playing?