Soylent powder mixed with almonds, banana and water going bad after 6 hours

#1

Hi all
I need advice:

I’m mixing about a half a scoop of Soylent powder with 1/2 cup soaked almonds, 1 frozen banana and 2 cups of filtered water (sometimes brewed green or fruit tea).
Adding:

  1. Pinch of salt, 1 date
  2. Alternating - mixing in a teaspoon of matcha tea powder on one day and mixing in 1/4 teaspoon grated frozen ginger and turmeric with cinnamon and a tiny pinch of cayenne on another day.
    I mix it in a Vitamix.

Storage: max 12 hours
Storing in a refrigerator in 2 separate thermoses.
Cleaning: I wash out thermoses and the cover cups daily with hot water and soap.
Problem:
Blended shake starts tasting sour and emitting gas when I open the containers after 4-8 hours.
I drink 1st shake about 4 hours after mixing and the second about 3-4 hours later.
The second mix always tastes “off” or seems fermented.

Help!

#2

It’s probably the banana, they go bad pretty quick.

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