Rekordbox recoding bug (it is either distorted or gets distorted after a while and stops)

I am using Rekordbox 7 (last update) on GRV-6 which also has an up-to-date firmware. The recording functionality of the software is very buggy as:

1- When I load a track to deck 1 and start recording everything is fine until the second track is loaded to deck then it becomes distorted. (I have to enable output via computers interfaces and disable it to temporarily restore that) 

2- While recording, the master signal gets lost although I can hear the song being played and then it stops recording. 

3- It starts recording and after a while the recording gets distorted.

No offence but I think you'd better remove this feature as it is really embarrassing. It's a like software being written by assembling a bunch of bugs together!