My routers IP default gateway suddenly change,unlike the old address i cant access this one.It always say "site cant be reached" ive tried trouble shooting it and still same results.I also tried resetting my router,and nothings change,i cant find my default wifi password,im using a KingType router model ES27 4F,i have a cable so i can access the internet,but my laptops and other devices cant cause we dont know the default wifi password,please help me guys!!