Worse, some players have complained that they've lost their earned classes, such as Quarian infiltrators and Asari adepts.
BioWare community manager Chris Priestly hasin the official Mass Effect 3 forum that the developer is aware of the issue, and is working to fix it.
In the meantime, Priestly advises gamers to avoid going into the Store while “Ready” for a multiplayer match and to not accept invites while in the Store. Players would unready themselves before enterting the store.
Mass Effect 3 was released on the 6th March in North America and the 9th March worldwide for PC, Xbox 360 and PlayStation 3.