Posting this since only other posts I found on the topic were a few years old, but this app keeps closing workouts while in use, sometimes it can't even do a 90 second interval without shutting down, I looked it up and it seemed like a common occurrence with no solution, but the posts I saw were all dating back a couple years, so I was wondering have any improvements been made since?
Edit: Honor 8X, C25K (Zen Labs free version)
