Since the 9.0 update this has happened twice, but not every time. I'm currently using a Garmin Coach 5k plan. On days with "cadence drills" that are run at x cadence for 30 seconds, then walk, the data field on-screen gets stuck. For example, it progressed from warmup to "run at x cadence" fine and counted down, but never switched to walk, sitting at "0:00 remaining". However, if I switched to a different screen and back, it would show the proper step, so it had been updating correctly in the background.
Has anyone else had this issue? I have another cadence drill tonight and will see if it occurs again.