Situation with heart rate and exercise app on Charge 6

[Chris1066]

After the last update I am seeing the following issues. 1) Inaccurate heart rates during Walk exercise. The reported rate will spike to 140+ after 2 or 3 minutes even though actual rate is much lower. This distorts the reported zone minutes. 2) I will get prompts to end exercise in Spinning after 3 or 4 minutes. I don’t get this in Walk or Treadmill. Neither of these issues were present prior to the update. 

Moderator edit: edited title to clarity.

[CrisVillaFitbit]

Hello, @Chris1066, welcome to the Fitbit Community.

Thanks for letting me know about this situation in regards to the heart rate and the prompts of the exercise app after the update.

Can you double check you're wearing the Charge 6 correctly, please? This may impact the heart rate and exercise app. Also, for certain Fitbit devices, if you pause during a workout such as at a traffic light activity tracking pauses automatically while you’re stationary (known as auto-pause). Your device vibrates to indicate that activity tracking is paused. You can check how to control this here.

[experiment322]

I'm also noticing heart rate spikes (one or two) during walking (auto detected) which didn't happen before the most recent update and the way I wear the Fitbit didn't change (same tightness I mean by this).

[agnosie]

I have the same issue with heart rate spikes while working. I already discussed this with the fitbit support without any help or solution. It seems to beca real bug.

[Chris1066]

 I wear the Charge 6 on my non dominant arm above the wrist bone. The end
exercise prompt appears on the Spinning and Walk exercises.  Walk is the only exercise that uses the GPS function but I am not sure if that is relevant other than placing an additional load on the watch's CPU?. I don’t get these issues in Treadmill at all. Pulse spikes regularly appear in the Walk exercise
but not others.
Please note that these issues only appeared after the last update.

[DLAlt]

I've been running for 40 years and I'm a family doctor. I noticed over the last year that my Fitbit, (both previously on an Inspire HR and now on my Charge 6,) the heart rate for significant periods of my runs was spiking to 170bpm to190bpm. I had no symptoms so didn't bother to check it for awhile. Two weeks ago I finally had a 48 hour holter monitor done, which covered 2 runs. The Fitbit continued to report such elevated numbers, while my holter said my heart rate never got above 130. While I was running, I also wore my friend's apple watch, and had my finger in a pulse ox monitor. Both the apple watch and the monitor confirmed the lower heart rate.

What's up with these Fitbits being so far off the mark??