I haven't had a chance to go through all the sonics, but we (Dan and I) did notice that the 50m sonic in port 2 is going through a cycle of 8000... then 3 secs of stuff... then 8000. This usually is the sign of a dead transducer/array, though I suppose it could be just a cable issue. I tried "tio 2 0/1" which looked like it did cycle power, but didn't help (which is what I expected).