At least three users have confirmed the issue with Garmin VenuSQ devices returning incorrect heart rate readings (after several hours it stops updating heart rate, and returns the same value all the time, even though the accelerometer data is updating correctly and Garmin Connect reports correctly varying heart rate). More details here: https://github.com/OpenSeizureDetector/Garmin_SD/issues/22.
V4.1.10 of the OpenSeizureDetector Android App is now available on play store. This version will enter a fault condition if this heart rate issue occurs while you have heart rate alarms active – so please run this version and let me know if you experience the issue, and which watch you are using.
V3.1.3 of the Garmin Watch app (Available from here: https://github.com/OpenSeizureDetector/Garmin_SD/blob/master/WatchApp/build/GarminSD_v1.3.3.prg) uses a different way of updating the heart rate data, and I am hoping that will address the issue – please will you try this version if you are affected by the issue and let me know if it fixes it or not?
Thanks,
Graham (graham@openseizuredetector.org.uk)