Help! Sourdough starter has lost it's power!
Please help me! I made a sourdough starter back in April and for the first 2 months it was working beautifully every time. The recipe I used was this:
60g starter (kept in the fridge, taken out the day before and 1/2 discarded + fed so it doubled in size)
Fed with 100g warm water and 100g white bread flour
Left to double in size (usually took about 3 hours)
300g warm water
a very small sprinkle of quick yeast (I know I know, not kosher)
450g white bread flour
50g wholemeal bread flour
Mix together all ingredients except salt
Autolyse for 1 hour
Stretch and fold every hour for 4 hours
Pop into banneton and rise in fridge for about 18h
Next day, preheated oven to 250 celcius and baked for about 45 mins or until dark brown and the base sounded hollow.
This was working totally fine and then all of a sudden for no apparent reason my loaves have stopped rising in the oven! Flat as a pancake.
The dough rises beautifully between stretch and folds and in the fridge overnight but as soon as I turn them out and put them in the oven, zilch happens.
What am I doing wrong??