Our house's cable modem is acting up extremely bad, when you plug the power cord back in, the modem starts to buzz/humm/screech (kind of like a long but subtle beeping noise). It'll allow one person to be online for ~30 minutes until the internet stops working. Before we have to buy another one, just wanted to see if anyone on OT could offer some advice or troubleshoot the problem. It just all of a sudden started doing it, it wasn't dropped or anything and no water has been in contact. Thanks in advance.