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LM311: LM311 with hysteresis not working in LTspice simulations

Part Number: LM311

Hi Experts,

Our customer is trying to simulate the following LM311 circuit with hysteresis in LTspice:

The circuit is supposed to be a comparator with hysteresis centered around 2.5V, with high threshold 3.1V and low threshold 1.9V. 

VIN is at a constant 2.5V when the simulation runs, but the output oscillates. What could be the cause of this problem?

Please help. 

Thank you and best regards,