So with a few planes under my belt I have noticed a similar occurrence with them all. You build your plane, tweak it, apply a finish. It works well, you go back into the house with a warm feeling and a fine coating of sawdust.
The next day you triumphantly walk into the workshop, master of all tools. Only to find your little wooden plane doesn't work as well as yesterday. Hmm...........scratching of head, a few minor tweaks, a sharpening of the metal bit and the plane works fine again.
This process needs to be repeated at least twice before the plane "settles down". I have found this with all my planes (gotta be approaching twenty, now) Most of the planes refuse to take a fine shaving - this is normally due to a bump appearing behind the mouth. Easily solved with a rub on some sandpaper on a flat surface. Others need a little more work on the wedge. Once you have successfully completed troubleshooting your plane you move up a notch on the "getting better at this" scale.
So please don't get put off if your plane doesn't work consistently. Once you work out how to get it back on track you'll be a better maker. That can only be a good thing!