Reports of technical problems by BlackBerry users on Friday echo the server issues that hit the devices last October.
BlackBerry has confirmed that users in Europe, the Middle East and Africa are being affected.
The server problems in the previous crash, which caused millions of users to lose service for three days, began in BlackBerry's EMEA region before spreading worldwide.
BlackBerry maker Research in Motion (RIM) said on Friday they are investigating the issue.
“We are currently experiencing a BlackBerry service issue impacting some users in Europe, Middle East & Africa. All relevant support teams are working to resolve the issue. We apologize to any customers who may be affected,” said a RIM statement.