bq40z50-r1 Q: how to fix FCC during discharge

Very strange bug:

firmware bq40z50r1, successfull learning cycle, full charged custom pack, 2 hour relax and control REST bit, in attached picture discharge cycle (blue - voltage, magenta - current, brown - FCC, violet - remian capacity). What happens?! Why FCC=2500->1112 and RemCap=0?!

I attach log file and srec file:

5314.pack152-138-log.zip

Srec make from official bq40z50r1 firmware and write to bq40z50 next algorithm:

- write original bq40z50r1 srec to bq40z50, reload bqStudio (v1.3.42)

- change chemistry from chemistry tab

- read flash memory and change setting to enable Gauge, FETs and etc

- write flash memory (tab "All") and command "Reset"

bq40z50r1-v12112015.zip

next cycle, next bug (lightblue - FCC, yellow - RemainCap, full charge pack, 2 hours relax)

log attached

pack152-138-discharge-1.zip

I get new pack, write the same firmware. Full cycle with learning is fine. I leave pack to relax and after last night I see FCC:

update status is ok: