Bx3105 cme error 903


I am using BX3105 to send packets over BLE connection at regular intervals (64 ms) and at random times the connection just stops and the module reports CME ERROR: 903 over and over. Only after reset does it start working again. I am using the latest version of firmware 2.5.0. Do you have any idea what can cause this message to show?

In the command reference, it says that it is a memory problem but doesn’t say much more than that.
Thanks in advance.