Amazon.com, Inc. (NASDAQ:AMZN) has been working on a premium version of its AI-powered voice assistant, Alexa. However, the project might be getting beleaguered by internal disagreements and technical hitches, possibly leading to further postponements. What Happened: The forthcoming subscription service, provisionally dubbed “Alexa Plus,” intends to deliver superior, personalized AI technology. However, despite conducting tests with 15,000 external customers, the new Alexa’s performance has been internally termed as underwhelming, frequently dispensing inaccurate information, reported Business…