Body battery too low

For the last 3 weeks approximately my highest level of body battery tops up at exactly 25.

I have had a cold for the last 2 weeks but now I'm much better and the BB still doesn't go above 25.

On my Daily Timeline, 99% of the time is shown in red as Stress (including sleep hours) and 1% in blue as Rest.

While I understand I might be more stressed than last month, it sounds very suspicious that the BB is topping up at 25 precisely for so many days.

I'm running software version 13.70, which is also a few weeks old so I'm starting to think that there is something wrong with the software.

Is this a known problem?