HDQ Data incorrect from bq34z100

Hi 

I have a problem with reading data from a bq34z100 using a MSP430F5308. I can read all registers fine, but randomly some will read back values that are quite incorrect (i.e. temperature would report back -117 deg C)

From what I can see, this is happening on all registers but not all the time, sometimes it is hours before it occurs.

Does anyone know of any problems with reading HDQ data over a long period of time?

Thanks in advance for the help