Why some of the NSE securities become untradable in NEST-platform all of a sudden?

I bought some securities in NSE cash segment through NEST-platform. Past few days four of the stocks that I bought is not tradable ( my orders are rejected for the stocks).

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NSE keeps moving stocks into T2T segment when it gets very speculative. Once the stock is in T2T you can only do delivery trades. Check this out as well.