[nicholassmith]

I've had this happen a few times (iPhone 6, iOS8.0.2), but I've found that powering off my phone and restarting seems to restore the data. None of it is truly gone for me, it remains logged and listed, but it's almost like it cannot access the database of data that's stored and it gets a bit wonky but I'm not certain on that. Hopefully Apple will have it fixed for the next version or the app will be dead in the water.

[zacharytamas]

Yeah I've had to restart my phone four times so far and the data does seem to come back, but anything that was logged during the time it didn't work isn't there.

Also, it seems to be losing whole days' worth of data from the MyFitnessPal app. For example, I'll have today's Nutrition data in there but tomorrow when I add breakfast it will likely have lost all today's data so the graphs always start "today" even though I had put data in yesterday. I'm not sure if this is HealthKit or the app, though, because things I put in manually using the Health app seem to stick.

[nicholassmith]

Re; MyFitnessPal, I've not experienced that but I've only logged 3 days worth of data so far since I connected it to HealthKit. It does seem to be an inconsistent issue for people as well, which makes it harder to determine which part is at fault. I think it's probably HealthKit as MFP reads data in (steps etc) fine.

[nicholassmith]

I'm having this same issue now with MyFitnessPal, so it could be an app bug. Annoying, seems to just add the most recent data.

[__chrismc]

This is similar to my experience (iPhone 5S, 8.0.2), though often I don't even need to reboot. Open the Health app; no data; close it; do something else for 1-2 minutes; reopen - data is now visible.

[nicholassmith]

I tried the leave it and come back and it didn't work for me, only a full power-off cycle. It does seem to be slightly different quirks across different user devices.