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LMC7101: unity buffer amplifier - problem with output voltage.

Part Number: LMC7101

In one of our product we use LMC7101 amplifier as unity buffer amplifier configuration for VDC=2.5V reference voltage at the input.
Recently we've got a lot of amplifiers, which are unable to give 2.5V at the output (it gives 1.88V) for 3.3V power supply and 2k Ohm load.
The research shows that the maximum voltage that can be obtained at the output is Vdd-1.5V also for 5V supply voltage.
My question is this the correct behavior for this type of amplifier?
Could it be some faulty series?