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NA555: The mini vin

Part Number: NA555

Hi team,

According to the datasheet, the minimum working voltage range of NA555DR is 4.5-16V, but customer have measured 5PCS samples, and the minimum working voltage is about 2.2V
Compared with the competing products currently used, intersil's ICM7555IBAZ-T, the lower limit of the working voltage is 2V.

Considering that customer are powered by batteries, the minimum working voltage is lower than 4V, so please help to confirm, what is the actual working voltage lower limit of NA555DR? Is there more margin than the 4.5V written in the datasheet, according to our test, it is around 2.2V. Whether could be 2.2V Vin work normally?