Outstanding followup and customer support!
AcuRite reps had told me that they anticipated a fix to the rainfall accumulation problem, and after a couple of months (without further need for me to contact them asking for more help) I was notified by email that a new base station was en route that should correct the problem. It did! I've had the new unit installed for nearly 2 months and it has worked flawlessly, and the accumulated rainfall numbers track correctly. Outstanding customer support by AcuRite, and much appreciated!