Cubase 8 Pro loses the asio driver often

Here is my problem.
I am running Cubase 8 Pro on win7 64 bit; my audio card is a roland quadcapture and Cubase loses regularly the asio driver (no more sound); I have each time to change the driver and bring it again to my quadcuapture to have sound…very anoying…
Anyone experienced the same issue?
Any suggestion?