An update on this issue. I've finally been able to reproduce and identify what is the problem.
It's related to changes we did to the table header, so tapping on it wouldn't trigger a timer start accidentally.
It's a timing-related bug, which means it doesn't happen all the time, but it can happen and it's more frequent on slower devices.
Unfortunately, there's no workaround for it. I've fixed the issue on the beta version of our upcoming release, and we're hoping to be pushing that to Apple early next week. After passing the approval process, it should be in your hands.
We apologize for the inconvenience this has caused all of you, and thank you for reporting the issue.
Ernesto.