[ultraman]

Since you haven't updated for a while it would be a good idea to identify the last build without the delay - this would be somewhere between your April build and #0901, and that might give a Kodi developer a clue as to what the problem is.

Sadly long process. But I think I got working and not working release.

working: #0717, 17-Jul-2018: Generic -- Release post (New 4.17.7 kernel; [guiinfo] Fix 'Slideshow.File(Name|Path|Size|Date)' and 'Slideshow.Index' labels - trac#17956.)

not working: #0718, 18-Jul-2018: Generic -- Release post (New 4.17.8 kernel; VideoPlayer: vaapi - fix copy path; videoPlayer: Fix/improve audio stalls of realtime streams; Fix crash in zero-copy games if dimensions are changed)

I assume the change would be VideoPlayer: fix/improve audio stalls of realtime streams (PR:14193, 2 commits, 2 files changed). Let's try to revert that and see what happen. With my working build I noticed that sometimes audio was not in sync with video. But it happen on channels not very important so I ignore that. Probably related to this change.

Update: Yes, much better without this PR. So I can update working build soon. Wondering for whom is this PR related.
It works fine with just reverting this: https://github.com/xbmc/xbmc/pull/14193/...fa04c43c8d

Update2: Final solution is only to set stream to non-realtime (realtime=false) in pvr client.