I have upgraded to 3.6.9 and all seemed well.
I did a test flight on 6/6 and all seemed well stable as always, no issues.
However, I hovered for a couple of minutes at 6m and then started to up to about 10m, but this time I noticed a weird reading of a negative (-1) altitude values on my OSD, never happen before.
I landed immediately without incident.
Sharing my log file here, any input will be appreciated.