First off; what is the model name of the transducer you are using with the 899 unit? Are you using the Compact Side Imaging (CSi – XNT-9-Si-180-T) transducer that came with the 899 unit or did you exchange it for the larger High Definition Side Imaging (HDSi – XHS-9-HDSi-180-T) transducer?
Is this a new problem or has it always been like this?