1. Control Centre does not communicate with VOX.
2. Headphone (wired) remote control does not work (probably due to above) properly.
3. Local music files not read from Music library if Apple Music app removed. Need to manually copy them via the 'File Sharing' setting in iTunes to the VOX Documents.
You have recently closed discussions, saying that iOS 11 is a "beta version". This is 100% false, it came out on September 19th.