Readiness scores on my new Charge 6 are consistently far too low

[AquamarineinCA]

Hi - I began using my new Charge 6 on November 29 (after killing my Charge 5 by snorkeling in the ocean with it on for over an hour).  Problem: my readiness scores since Dec 5 have all been consistently extremely low.   (below 30).  I'm attaching screenshots of the past week's readiness scores, sleep scores and zone minutes.  

How can I fix this?  Is my new Charge 6 defective, or is there something wrong with the app?  I've restarted my Charge 6, but that didn't change the readiness scores.

I miss having readiness scores that were useful!

), even though my activity levels have been moderate, sleep reasonably good, etc.

[AquamarineinCA]

Oops, looks like readiness score screenshot didn't attach.  Here it is: