Share price of Sonata Software Ltd. tumbled on Thursday, after its largest client expects a cut in Q4 revenue.Sonata Software's international revenue during Q3 stood at $87 million, growing 2.8% QoQ and 3.9% YoY in constant currency terms.The company's management expects a sequential revenue decline of 2.5% to 3.5% in Q4 due to unplanned ramp down and a one-time discount.Shares of Sonata Software fell as much as 14.04% to Rs 288 apiece, setting a new low since April 7.