OneStepAtATime

No, I don't.

I am having the same exact issue.  My audio and mic completely cuts out the second MC loads up on PC

I had this issue as well, for two of my three realms, nearly two weeks ago.  I ended up calling Xbox for assistance as I hadn't heard back from MC fast enough for my work.  After going through lots of troubleshooting issues with Xbox, they eventually had me renew the subscription (purchasing it again).  They refunded me for both the purchases as I had technically paid for them already.  I suggest calling Xbox again.  I can recommend you to the person that helped me and gave me the refunds.  I do not have their name, unfortunately, but if you give them this case number (7005734733), tell them you'd like to speak to the person that resolved the case.

I agree with the recent comment made by Jack.  I've been having this command issue for a week now.  It's been frustrating as I use command blocks a lot in all my realms.  I tested out what Jack said, by giving a hover note/name for the command block, and it saved the command too.  Great solution that's suitable enough till things are fixed correctly.  I recommend it; thank you, Jack!