Charge 5 poor heart rate data

[Jpr5000]

My Charge 5 is poor at heart rate for anything but run.  Prior Fitbit’s were excellent.  I do mostly run, Bootcamp, circuit training and tennis.  I know my heart rate is maxed sometimes in Bootcamp or CT and it shows blue or yellow with much lower average than prior FBs for same exercise. Oh and I do tighten band.  Any ideas?

Moderator edit: subject updated for clarity

[DavideFitbit]

Welcome to the Fitbit Community forums, @Jpr5000.  

Thank you for sharing this information about the inconvenience you've been experiencing with your Charge 5. 

Before considering other options, let me know if you already followed all the instructions in this article to improve the accuracy of heart rate information and check the information mentioned here about other factors that could affect your heart rate reading, as this has been useful to other users who have experienced something similar. 

In addition, I recommend that you try restarting the device using the three pulse restart method mentioned here below, instead of the restart option found on the Charge 5 itself: 

1. Connect your device to the charging cable. For instructions, see How do I charge my Fitbit device?
2. Press the button located on the flat end of the charger 3 times within 8 seconds, holding each press for about 1 second.
3. Wait 10 seconds or until the Fitbit logo appears.
4. If the device doesn’t restart, wait 15 seconds to try again.

I'll be around.