My resting HR starts low in the morning and goes up during the day. I do not wear the watch during the night so I wake up start the watch, put it on the go back to bed for 10-15 minutes before starting to move around and perform the daily routine (which involves elevation of the HR). While I am still in bed I check the resting HR which is, let's say, 60. After I am done with the morning routine and I am resting drinking my water I check the resting HR and I find it to be 66, for example. Now is two days in a row. The 5x is quite new but I have a 3HR and it most definitely does not act the same. With the 3HR it was enough to keep for a little while the HR low and it will refresh the resting HR value to the lowest HR value kept for a while.
I am on the latest firmware. Any thoughts? Thank you.