PiJuice Zero - Shuts down Raspberry Pi 2W abruptly without warning

[ollax452]

Hi!
I have a technical issue with the PiJuice Zero and the 1200 mAh PiJuice battery.

Battery, PiJuice Zero, Raspberry Pi 2W connected and not used in 2 month (no battery power left). Today I charged the battery up to 70% (via the PiJuice Zero USB). After that I started the system and after a couple of minutes it completely shutted down (running only on battery). With no warning. No keyboard, mouse are connected, running headless via Putty. I started the system again and it indicates good battery level (above 50%).

PiJuice settings:
I have enabled a system task to shut down if lower than 5 % (minimum charge threshold). No other tasks. Firmware version 1.6. The battery profile I use is PJZERO_1200.

Any ideas?
Best Regards
Olle