Battery critical on first use

Hi there. Brand new to nuki, bought an ultion nuki for an escutcheon lock. Installed and set up, door won’t open full (latch doesn’t come in quite far enough, lock mechanism works fine though). Battery status starts at >90%, but instantly goes down to critical. Same with brand new batteries. Any idea what’s wrong?

I had same problem, check this: Smart Lock (4th generation) Firmware Beta 4.7.x - #7 by Toni_CB