AT%13% from commands in GSM Scanner example

Hello everyone,

I've got a problem with the official GSM shield and I hope someone can help me.

I've used the shield for a while without any issues, but it suddenly stopped working - I can not get gsmAccess.begin() to work (it always returns AT%13%). Getting IMEI/setting band etc. works, but anything related to gsmAccess will fail. I've tried the official GSM Scanner example without any success.

Can anyone share any insight on this?