Can isn't a problem people. If anything, it's heartening that he's running his lungs out under Klopp. He was certainly guilty of being a bit lethargic in the past.
He's still only 21 and has been shunted from position to position in his short time here. If he's going to make a particular position his own, there are bound to be teething issues. These aren't dissimilar to the issues Henderson had about 3 years ago - headless and sometimes bereft of ideas. If anything, Can is starting from a much higher talent base than Henderson. I think he'll be an immense player in 3 years time.