[CA] C80 with DSM30 Connection Problems

I'm using a C80 with a DSM30 and P79 transducer. The C80 reports depth info for about 5 seconds and then stops and gives a no input error. After about 1 min it repeats this pattern. My C80 software is the latest available v5.16.I have tried to update the DSM 30 software and it completes to 100% on all blue bars but then gives a blue screen software error at line 460.How do I update the DSM30 and will the update fix the problem?Thanks