Overuse of sodium metabisulfite in gold bearing solution

[Yggdrasil]

Hello Guys.

Good day!
I followed procedures as advised in here last time; on how to make the HCl and the Nitric properly and then to used sulfamic instead of urea for denoxing. I also changed my old SMB to new one ( from a different supplier). But when I did the precipitation and added the SMB, my gold solution become very cold again (15 deg C) and I have not precipitated the gold, the same result with my other experiments... I really cannot comprehend what went wrong.

Thank you for reading, your inputs will be highly appreciated.

How much SMB do you use in how much solution?
Just to overcome this you could make a saturated solution of water and SMB and then add that.
One upside of this is that all the SO₂ will be released in the solution.