Recording stops at 4 minutes - CQ 18T

Just started using my new CQ 18T. Trying to record live performances to the SD card. Got a brand new, 35 GB SD HC card and formatted it. Started the recording at the beginning of my set and noticed it had stopped at some point during my first song. Tried to restart the recording but same issue. Only recording 2 tracks. Is there something I’m doing wrong?