Playback / mixer for MuseScore 4

I would just like to report several rather serious bugs with playback:

1. Playback will work well, then, for no reason it begins to stutter and play with much lag.
   Workaround: Reboot the computer and go back to my score, playback is OK. Obviously not a satisfactory workaround. I have seen other forum posts about computer specs, buffer size, etc. but I do not intend to go down those rabbit holes. This is clearly a bug, i.e, works then stops working for no reason and with no indication (e.g., no message).

2. I made an edit in the middle of a measure, changing two notes to rests. I began playback again starting at the previous measure. Result: MS played back up to the where the notes were (now rests), but would not play the remainder of the measure I edited.

3. Sometimes some instruments just do not play. Stop, hit play again, and all is well.

4. I installed some "Muse Sounds" instruments using the Muse Hub. That was a buggy and confusing experience indeed. Using the new sounds even buggier (stuttering playback, sometimes no playback at all, etc.). Great potential, but they simply do not work.

Bottom line: I hate to be a complainer and I truly appreciate the effort of everyone who develops and support MS. But MS4 is not ready and so, like others on this forum, I will probably go back to MS3.