I first purchased my RE300 several years ago when I was hooked up to the local cable company which was on 2.4G. Even though it was active all those years upstairs in my living room, barely used it. Now I dropped my cable and went with T-Mobile, and have a T-Link gateway. Unfortunately, my RE300 will not hook up to it and it is 5G, so is the RE300. Is it because of the transition to T-Mobile?