Issues with saved session

TeamViewer 12, Corporate license.

When we saved an session of conference we got 2 issues:

- no sound at start of .tvs during 10-15 seconds. All users heared voice ok without any drops.

- sound saved ok, but after conversion (independent to codec) - silence at first 10-15 seconds ...

6 saved sessions - 2 with issue1, 1 with issue2 ...