Sorry, it's A4 ,not A3

Hey Zeno!
When you are able to hit notes in your upper register effortlessly but
your middle range is shot, it basically means that you have overworked your muscles.
If that happens, give your voice a break until the next day.
Yesterday I had the same problem too. I was able to scream my D5s and E5s like a banshee but my middle range was shot. We all have to find out for ourselves how much practicing is enough and how much is too much.
Don't forget that singing muscles are just that, muscles, and muscles can tire
if you put too much pressure on them.

Take it slow and don't sweat it ;)
René

Thanks for your reply!
It also cracks when I speak in lower tone too..
It sounds discontinuously that I've never been, a bit like the the "#57 Mmm Fry example"of RYV book.
Hoping it's not a serious damage....

you're welcome, Zeno.
How long have you been experiencing this issue?
A vocal fry in your lower speaking voice or your speaking voice in general
could be a sign of swollen vocal folds. If your folds are swollen they can not take
the pressure as usual so they switch to fry to protect themselves from damage.
Actually they do that every day after you wake up.
Fry is created by a glotal unbalance to protect your folds.
In the morning your folds are not warmed up, the blood flow is not strong
and therefor they are quite unflexible.
In short form: everytime your voice produces unwanted fry, your folds need protection.
But I don't think it is a longterm damage!
I have had that issue before too. Just give your voice a break for one or two days .

You'll be alright :)
have a nice day!
René

Thanks again;)
It just happen at my lower range of speaking and when I push to speak louder at general range, and also at the high range. But when I speak normal, it's fine.
Yea I think you are right. My folds are probably swollen 'cos I feel a little bit tension inside my throat all the time, since it happened 2 days ago.
Thanks for your answer! Relax me a lot! I will take 2 more days rest and should drink some more water.

yeah just give it a break!
Besides water you should also drink zink which
is a great help for your voice.
Furthermore drink hot water with honey, you can also add lemmon and ginger if you want.
An exellent help for swollen folds is liquid licorice!
try gargling that stuff, you'll be amazed :)
You should be able to get liquid licorice in an ordinary drugstore.
Gargling is a lot more helpfull to the voice than just drinking.
If you just swallow the good old H2O it will need twenty minutes
until it hydrates your folds. But gargling hydrates immediately.
Gargling also prevents you from over- hydrating your body!

Good luck!
kick those vocal problem's a** ;)
René

Wow!! Thanks for the tips!! Helps a lot!! Deeply appreciated!!!