Hearthrate at rest from the day before not in the average HRR menu

So it appears that the FR235's built-in Heart Rate Widget is faulty. What's new?

When I go to the hearthrate menu and watch the HRR from the last 7 days,

Your terminology needs correction to eliminate confusion:

• HRR stands for Heart Rate Reserve, which is the range between Resting Heart Rate (RHR) and Maximum Heart Rate (MaxHR).
  
• A menu, in the context of the application code on the device, is a scrollable list of items from which the user may select one. I take it you were referring to the Heart Rate Widget, and accessing the chart by pressing the Run (Select) button, not the menu that you can access when you press-and-hold the Up button while in the Heart Rate Widget, or any other menu for that matter.
  

my forerunner indicates that I had no HRR the day before. The next day, I have the same problem. Anyone else who had this problem…

Sure.

• There is no data point for yesterday (whichever day of the week that is at the time I check) on the Last 7 Days RHR chart, and a straight line joins the data point from two days ago to the data point today. There is also no data point for the day six days ago.
  
• The chart does not match what either the Garmin Connect Mobile apps or Garmin Connect online shows as the RHR ‘trend’ over the past seven-day period, which includes data points for each of the six days before today, and the value of the data point for a given day doesn't (always) agree with what the Last 7 Days chart in the Heart Rate Widget shows.
  

or can solve this?

If Garmin's built-in widget is wrong, then all you can do is uninstall it, and (develop and/or) install a different widget that presents the correct information to ‘solve’ it.

If Garmin's built-in widget is wrong, then all you can do is uninstall it, and (develop and/or) install a different widget that presents the correct information to ‘solve’ it.

It's definetely wrong, both - HRR and Widget data... HRR calculation not correct at all - for me it calculates more times after workouts not at the night or in the morning and less than my real HRR by 8-12 bpm. And then this data goes to widget... In GC it's more reliable (and different from watches data for sure) but also not correct sometimes, but it's fault of OHRM...

I ment Resting hearth rate

Yes, I also meant RHR.

Now, RHR became worse in my case...

Before update it stabilized at 50+- (my real one now is 54-56 in the morning) and in the morning it was 44 and now - 37!!! It's owfull, GC shows also not much reliable 46!!!