the lost sonar contacts are a big pain. i found that all though i can't hear anything, they still show up (in rfb) on the plotting board as the dashed lines. however, taking a peek with the scope, then returning to the plotting board they're gone. eventully, they return, but it is really stupid to be losing contacts from units that are pissing distance away.
it is somewhat irritating, that these day's, when one buys a game; that it takes the modding community to make the game more what one expect from it when one bought it in the first place.
hats off to all those trying to make a better game. i for one thank you much.