Cubase 7 Error (yamaha asio driver probably)

i bought steinberg ur22 soundcard and cubase 7 installed everything and ok. But when im playing or recording something on cubase a problem appears, sound crashes for a second and plays back again (with yamaha usb asio driver) . When i use asio4all driver then it stops but it cant find the input source with asio4all so i cant record. any help?