Can't edit alarms on my Charge 5

[UserJB66]

I cannot change the alarm time.  I can change the hour, but everytime I try to change the minutes, the screen goes blank and I end up having to put it back on charger.  Waste of effort, so fed up with this now

Moderator Edit: Clarified subject

[Talahthas]

Welcome to the Fitbit community, @UserJB66!

Sad to hear you're having issues with your Charge 5.
As a first approach to hopefully get things fixed, I'd suggest restarting it. Before doing so you should make sure you've synced your device to not lose any data tracked so far. Also you should verify that the charging contacts on your device are clean and the charging pins on it's charging adapter are clean as well and can move flawlessly. In doubt please have a look here:

How do I clean my Fitbit device?

Next please closely follow these instructions as timing is crucial for this procedure:

1.) Connect your Charge 5 to the charging cable which has to be connected to a reliable power source.
2.) Press the button located on the flat end of the charging cable 3 times within 8 seconds(!), holding each press for about 1 second(!).
3.) Wait around 10 seconds until the Fitbit logo appears on your device's display.

I'd like to point out that it sometimes requires more than one attempt to restart Charge 5. So, before throwing the towel, please give it another try. 

I'll keep my fingers crossed.

[MarreFitbit]

Hi there, @UserJB66. Welcome to the Fitbit Community Forums. I'm sorry to hear about the inconveniences you've been having to edit/change your alarms on your Charge 5.  We‘re taking your comments and sentiments in regards to our products into consideration. We're here to help you! 

If the steps provided by @Talahthas don't work, may I know if your Charge 5 is crashing with another app? If so, as our last resort, I'd recommend performing a factory reset on your Charge 5. Important: Take into consideration that a factory reset deletes any stored data, which includes all data that hasn't synced to your Fitbit account and your applications, alarms, etc. 

So please make sure you sync your Fitbit device before proceeding with the reset. Regarding your sleep data, try syncing twice in a row to make sure all data is transferred. 

With the above being said, please follow the steps below in the order listed to complete the factory reset:

1. Swipe down from the clock screen to find the Settings app.
2. On your Fitbit device, open the Settings app > Device Info > Clear User Data

Once the above has been done, you can now proceed to set up your Charge 5 again by following the steps provided here How do I set up my Fitbit device?