Distorted sound Host: Windows 10 Guest: Ubuntu 18.04

[Han Fastolfe]

Distorted sound after about 8 minutes, restores to normal by another minute.

Repeat this issue indefinitely with random times.

Recorded audio debug wav files as in https://www.virtualbox.org/wiki/AudioDebug and found no file with distortion. (So they are not attached)

It should be the first case in Diagnosis table

Playback in running VM	Dumped file(s)	Diagnosis
Distorted	OK	Host driver (backend) problem

Same issue with a previous configuration Host: Windows 7 Guest: Ubuntu 16.04 with many versions of VirtualBox. Only VirtualBox 5.2.7 solved partially as instead of distorted sound it goes mute.

Thanks.

P.S. Classified as major priority as this issue is a long time pending.

P.P.S. by the way debug wav files are not compatible with windows media player