Resting HR goes up during the day

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.
  • The problem it is not solved. Now the watch is again sent for repairs and the guys at the store are telling me that Garmin said that my watch is working as it was supposed to and that there is nothing to do.
    The RHR it never worked right, the graph is all over the place as oppossed to the graph made by my Fenix3 HR. Another satisfied customer.......
  • I have the same issue. I have a Fenix 6 and do not wear it to sleep. This morning I woke up but still in bed for a while and my RHR was calculated to be 49. I then spent the day working at my computer and just looked and my RHR is 55. It should never increase if it calculates your RHR from the lowest minute average while you are awake.