HR sensor stops working randomly

[Sam_Docker]

Hello. What could be a problem? I've attached screenshots, there you can see, the problem occurs every week. I've marked the date and the gap in the graph. It pis me off, because it can happen during sleeping. I assume this can influence spleep tracking accuracy. Also I've noticed could happen during workout. I just do not trust measurments. Sometime HR suddenly starts working, if not, I do "2 button" restart.

[LiliyaFitbit]

Welcome to the Fitbit Community @Sam_Docker. I am sorry for the delayed response. 

I appreciate your participation in the Forums and sharing the difficulty you're experiencing with tracking your heart rate. Thank you for your efforts to provide screenshots. I totally understand how you are feeling as you would like to receive an accurate information about your activity. I appreciate your efforts to resolve the issue and providing the additional details. You can double check the tips to improve the accuracy of heart rate tracking here. You can find the complete troubleshooting steps in this help article: Why don't I see my heart rate on my Fitbit device?

I've shared your post with our Support team and they've mentioned that you already have a case with them. I know they will be glad to help you out and provide you a solution, please continue working with them. 

I'll be around if you need further assistance.