Yeah .. it's called 'drunken planesman' syndrome. It was introduces in 1.03 and it should be fixed in 1.04.
Akula at 5kts, big depth change from deep to shallow (like from under the layer to PD), almost 100% chance of cutting TA with 1.03. The mechanism is like this: sub surfaces .. bug makes it pitch down .. sub pitched down is slowed down by water flowing around it (correct) .. sub reaches speed 0 and then negative .. TA is cut off (simplistic, but correct).
The TA loss happens when sub reach negative speed. It is not caused by TA colliding with the propeller - such thing seems not to be detected.
If you want to avoid it, check your speed during ascend. When it gets under 3kts, put some more steam into engines .. don't worry about the noise. In DW both noise and cavitation are based on actual speed against ground, not on actual engine order or RPM (there is nothing like enine RPM even simulated).
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