internet issues

I've been having trouble with the internet of our ATT Uverse system. Oddly, some of our laptops worked fine with it, but my daughter's Levono and my iPad lost connection with the internet a lot.  It got to the point where my iPad would download my mail, but anything else I tried to do got a "not connected to the internet message."  I chatted with a representative, who "refreshed the lines" and now it works, though they wouldn't admit there was any problem with the line.  They now tell me to put the cordless phone further from the router, though they put the phone jack right next to the router.