Xfinity Technicolor modem/router TC8305C "unidentified network" message occurs sporadically without any apparent pattern. Sometimes that problem goes away all by itself after 15-20 minutes. Sometimes I have to re-start the laptop. Cable connection works fine. To get around the problem, I've connected a separate router to TC8305C and switch to that one whenever the problem occurs.
OS is Win8, laptop is Samsung NP770Z7E-S01UB.
Any suggestions on how to fix the problem once and for all would be greatly appreciated.