Profile Generic_Voltage/current Events and Billing Read-Count based issue.

Hi Mikko,
I am reading IS 15959-2 METER Using Gurux for Generic events read
Profile Generic_Voltage Events and current events Read-Count based issue throwing error as "Memory Insufficient" when reading count based for the following below cases

1-With Authentication+Encryption,Our maximum Buffer entry=40, when I am trying to read from 1 to 27
Its throwing error as "Memory Insufficient".
trying with read from: 1 to 26 or below or 1 to 28 above its working fine. Only the Particular read from
1 to 27 only throw the error.

2-Without Authentication+Encryption,Our maximum Buffer entry=40, when I am trying to read from 1 to
27 ,Its reading records up to 26 but the error message not generated

Similar case happens for Billing Profile Generic: here
1-With Authentication+Encryption,Our maximum Buffer entry=12, when I am trying to read from 1 to 5
or 1 to 9 Its throwing error as "Memory Insufficient".
when trying with read from: 1 to 4 or below or 1 to 10 and above or 1 to 6 and above except 1 to 9
above its working fine. Only the Particular read from 1 to 5
or 1 to 9 Its throwing error