SINGAPORE (Reuters) -Sharp falls in technology stock prices are cause for caution but not panic yet, say brokers and investors who have been riding a runaway market to record highs and some stretched valuations. For now, it's the speed and not markets' faith in artificial intelligence that is in question. "The selloff appears to be largely positioning-driven, with recent outperforming names taking the worst of the move," said Jon Withaar, senior portfolio manager at Pictet Asset Management in Singapore.