To use as little as power as possible BQ40Z60 is being put in time based shutdown.
Unfortunately they have a situation where it is not waking up anymore
According to Technical Rerference Manual (page 73) device wakes up under following conditions:
" The device returns to NORMAL mode when voltage at ACP pin > V STARTUP. "
Based on datasheet (page 5) Vstart-up is max. 2.45V.
They have measured the pin directly and the voltage is far higher, around 3V but BQ isn`t waking up.
They also see some temperature dependency with that problem