NCO phase drift

Hello,

I have an NCO generating a 60 Hz sine output.

input clk = 10 khz

phase accumulator precision = 32 bits

angular resolution = 32 bits

magnitude precision = 10 bits

phase increment value = fixed at 25769804

It is a parallel cordic implementation.

My problem is I get a phase drift over time.

I am a new user and would like to understand this better. Any insight would be appreciated.

Thanks