Does this only occur with TrueHD tracks?
There is a known issue with the playback of TrueHD tracks on Kodi (upstream issue).
But the dropouts should be somewhat rare unless you are playing specific titles (Disney studio releases primarily). I wouldn’t expect these dropouts to occur every few seconds however.
You mentioned some sync errors in a previous post, but I’m not sure how you can get that with passthrough, and do see that in the logs you’ve provided here.