If it were me and I had the option of returning it and getting my money back then that is exactly what I would be doing right now rather than dicking around with what could be a troublesome meter with no guarantee of a satisfactory outcome. Alternatively I would start by taking some current draw measurements to guage how much she is being dragged down, for reference my measurements are as follows on a 2010 Fluke 289 with a firmware version of 1.16 upgraded from version 1.12 :
Power Off, Logged for 20 minutes.....32uA
Power On, Ohms Open, BL Off..........22mA
Power On, Ohms Open, BL Low.........36mA
Power On, Ohms Open, BL High........56mA