In a note to investors on Thursday, Citigroup analyst Jim Suva cut his rating on shares of RIM stock from Buy to Hold, dropping his price target from $80 to $45. Suva had upgraded his rating on RIM shares from Sell to Buy back in February on the assumption that the Waterloo, Ontario-based company would take advantage of Nokia’s plummeting market share. “We believe RIMM is letting this opportunity slip,” the analyst said on Thursday. Suva continued, ”Thus far our supply chain checks show that RIMM’s new models have not yet been certified by major wireless carriers and are not in mass production, which concerns us as typically 30-40 days prior to launch new product should be in mass production.” Earlier this month, BGR exclusively reported that RIM’s BlackBerry Bold 9900 smartphone will not launch until September, despite its unveiling at BlackBerry World this past May.