[cm14] [urushi] Sound stops during video recordings

[Bugchecker2]

I am using ROM lineage-14.1-20170514-UNOFFICIAL-LegacyXperia-urushi.zip (Adrian) but I suppose that this is problem occurs not only here...
When I record videos the sound is properly recorded only during the first 15 to 40 seconds. Longer recordings have no more sound after this time frame.
I tried several audio settings of the camera app and video resolutions but there is no change.
Also other than the standard camera app or another urushi mobile have the same problem.

There is no error message at all. It just happens... (so there won't be any log)
A very strange phenomena.
Please let me know if you should not be able to reproduce it.