What size card is it. The Rebel Series/ XXXD/ XXXXD lineup doesn't play nicely with cards bigger than 32GB. It will often cause the camera to lockup or hang. Stick with multiple smaller cards instead of a large 128GB card for example.
-Demetrius
Bodies: EOS 40D & EOS 5D Mark IV
Lenses: EF Holy Trinity, EF 50mm F/1.8 STM, EF 70-210mm F/4 & EF 85mm F/1.8 USM
Speedlites: 420EX, 470EX-AI, 550EX & 600EX II-RT
