Heart rate suddenly inaccurate on Inspire 2

[breonko]

Hi, I hope this makes sense. I have an Inspire 2. Never had an issue. In the last week I had the following problem: I walked the same route for 4 days. On 2 days my max heart rate was 152 bpm on the incline. This is consistent with how I feel and my max heart rate in the last 3 months. On two other occasions, I felt the same as the previous day and the pace and distance was the same, but my max heart rate on the incline is 117 bpm? Same temperature outside. Same everything. Does anyone else have this problem? Could this be s problem with the watch itself or the app? Any advice appreciated.

Moderator edit: clarified subject.

[ManuFitbit]

It's good to see you participating in the community for the first time @breonko. 

Thank you for taking the time to share all this information regarding heart rate. 

If you believe that it's a recurrent behavior, I recommend that you try restarting the device.

In addition, please follow 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, this has been useful to other users who have experienced something similar.