I had same problem,after doing everthing I could think of I noticed I was hooked to someone,s internet in neighhood.Took me awhile but got it back to my Router,this has happened a few time,s,i have 65mps someone else close has a lot more than me.I now make sure I hook to my internet,and then at time,s it will jump back to neighbor,s and I do hook to earthnet.Make sure it,s your line.