Do you actually hear "pinging" from your sonar?The only way I know to use sonar is to manually trigger a ping ( to verify range to target ) or to establish "depth below keel"
Your hydrophones, which are a passive means of detecting targets are always manned, but cannot lead to your being detected by escorts. They're just listening devices.
It could be that your approach to the convoy is too fast, so the escorts are picking up the sound of your engines/propellors, or that you're using the periscope too much - escorts can see it, especially in calm conditions.
The best rule for attacking shipping which has an escort is run silent ( = very slow ) and use the 'scope as little as possible. Once you have your firing solution, fire, dive deep and turn ( still silent and at 2, or 3 knots.)
Good hunting.
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