The latest incident with high battery drainige was now when also mobile data started behaving badly (no 4G, no internet).
I got about 400-500mA constant drainige and I saw with CSD tool that instance /usr/sbin/ofonod was using 100,2%. It sounds a bit weird to my ears.
When I got mobile data working again with multitude of resets/flymodes, then ofonod wasn’t anymore at all on the list of power consumers. Drainige dropped to about 100mA.