Hi guys.
I get a similar problem. Missing hydrophone sounds in all weather and fog so thick that you have to be literally next to the target to see it!! (may be realistic but the fog occurs on a very regular basis).
Sometimes I can clearly see a target but the "game" doesnt see it at all!!
Crazy!
Im starting to lose interest which is strange for me as I am a big fan of the series and play almost every day!
Shame really.