bq40z50 current draw

Good day,

We have an application that uses the bq40z50, and we are seeing what appears to be a fairly significant voltage drop per day.

On average it's about 80mV per day even with the pack in sleep mode.

Over the course of a week, the fuel gauge will drop about 4%.

This seems awfully high.  I see that the bq40z50 is now NRND and has been replaced with the bq40z50-R1.

Are there any known issues with the bq40z50 drawing current to drain the cells in such a way?

I can provide further information as needed.

Thanks much,

Kevin