We have fixed this annoying issue. And we were (maybe) wrong on the previous incident update, this issue occurs because of the library we use (@discordjs/voice).
After doing some research, we saw on their Discord.js GitHub Issues page, and on @discordjs/voice library have small bugs in their code. They have fixed the issue and they bump another version which means we should update it.
So, we tested Shaii in our lab (Hyperion Lab), and it seems Shaii is perfectly working as usual. We're sorry for any inconvenience and thank you for bearing with us.
If you still keep hearing the audio laggy, sped-up song, etc from Shaii, that is because our server is having an issue with the server provider we currently use. This type of issue is not related to the previous issue (Random voice disconnects). We can't do anything about this one, because we are far beyond fixing this issue, which means it's impossible to fix this type of issue. We only need to wait until they fix the issue.