I purchased an Ionic last year in August and I have loved using it. I've found the HR and sleep data to be very informative.
About a week and a half ago, the HR numbers went crazy - things like 165 while sitting at my desk, peak heart rate readings while sleeping. Sleep data is hosed because it can't tell when I'm asleep. I restarted the device a several times and did a factory reset. Upon contacting support, they suggested another factory reset. This hasn't fixed anything.
Their update this morning - essentially, we know about this and we can't help. Really? There have been no firmware updates, what "known issue" started 10 days ago? At this point, with no HR or sleep data, I have a very expensive rechargeable watch. I am going back to my Casio G-Shock while I decide if I want an Apple Series 4 or I wait until the new toys come out in September.
Great job Fitbit! You have lost a formerly happy customer.
From Fitbit support:
Thank you for getting back to us and for your cooperation in going through the suggested troubleshooting steps.
We’re aware of this issue, but may not be able to provide a fix in the immediate future. We'll continue to monitor the situation, and keep our team informed of the impact to you and other customers. We understand that this isn't the resolution you're hoping for, but rest assured we're always working to improve our products.
We're sorry for any trouble. We appreciate your patience and look forward to getting you back on track.
We appreciate your understanding in this matter. Please let us know if you have any other questions.
Moderator edit: Updated subject for clarity
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