Flipkart — Flipkart items are Not Deliverable at my pin code suddenly

I have been purchasing from flipkart at pincode 781012 for almost 3-4 years now with no issue at all. Suddenly almost 80% of the items from almost all the sellers went to Not Deliverable status / Currently out of stock for 781012 about few days ago. But when I check the same product for a pincode almost just 2kms away I.e. 781011 it's showing available. HOW SUDDENLY ALMOST ALL THE PRODUCTS went to Not Deliverable status for the first pincode. This is true for same product for multiple sellers. Both these pincodes are in the centre of town. This doesn't even make sense.