When I swtich poi camera canon eos kiss x3 to kiss x4, The old sd card doesn't work when I use 720p 60fps HD video or higher resolution.

It because of the SD card data transfer speed was not good even it says class 10.

I researched and found Sandisk Extreame is one of the best SD card. I have been using this SD card after that, but I never had problem again.
I strongly recommend you to buy one of the Extreme SD card higher than class10 30MB/s if you use HD video.