My guess is that people feel that too many bb10 leaks have come out and from the leaks there doesn't seem to be anything special. Therefore no reason to invest till possibly the week of jan 30th. If the stock was climbing, then people would invest just so they don't miss out on gains, but since it's not climbing, no reason to put money in right now.
Also, the chance of rimm announcing anything amazing has dropped since so much has already leaked (aka higher risk for a speculator)