I’ve been using the Arccos Launch Monitor for a while now, and I’ve noticed that sometimes the data doesn't update as smoothly as it should on my iPhone. It turns out, it was a cellular data issue causing the lag. If anyone else is experiencing this, I found this guide that shows how to fix iPhone cellular data that's not working. After following a few steps from there, everything started syncing properly again. Worth checking out if you’re having trouble with connectivity or data updates.