C 10.5 Audio Recording Stops after few seconds

Can anybody help… as mentioned above the whole day (time) cubase was working well suddenly while recording cubase stop doing it i have changed nothing all is the same so i thought it’s because of C9 version so i did upgrade for 119€ (witch i didn’t want to) to C10.5 but the problem still exist it’s quit frustrating i just can’t continue the work please help!!!
My A-interface has the latest driver version RME babyface Pro running through Mac Pro (Mojava) i will be happy if someone can help.
PS. this happened only in one project all others works well as usual