mobile

hi all

I have a problem with micro sd card , 32 gbyte, by Sandisk, Class 10; when I have not installed the card, ascend mate 7 works fine, wake up, after deep sleep, is instant, when I press power button. If I installed microsd, and phone remain in deep sleep for a few seconds, with screen off, I see wake up lag when I press power button. it takes 1 second more to wake up the screen ; do you know why? have you got some fix to solve this?
thank you