Whatever you are doing, keep doing it as it obviously assists your kidneys in their function !
Have you changed your diet a little or your liquid in-take ? It may be a little something you have added or changed which is "inspiring" your kidneys right now...
Whilst pre-dialysis, I went through similar stages as well and sometimes it is something very small which gives the kidneys another "inspiration" to keep on going...
I wish you good luck and a very long time pre-dialysis and all the best from Kristina.
P.S. Whilst going through similar stages when pre-dialysis, I noticed that the kidneys don't need "big" changes to get "inspired", but every little practical assistance really helps a lot... Good luck!