Nokia has confirmed the problem. In a post on its Nokia Conversations blog, the company says that a memory management issue is causing a loss of data connectivity for some users and that it's already cooked up a fix for the bug. An update is expected to be pushed via the Zune software on or around April 16th. Affected Lumia 900 owners also have the option of exchanging their existing device for an updated handset. Nokia and AT&T aren't stopping there, though, as they'll also be giving a $100 AT&T bill credit to anyone that's already bought a Lumia 900 or will buy one through April 21st.