When Downloading Files Connection drops

Hey guys, About an hour ago i was downloading a big file, as i was waiting for it to download i see that it stopped receiving the file. I then notice on Firefox that it lost connection. I closed it and opened it again re downloaded the file and the same thing happens. This has never happened before i have a Netopia 3347NWG for about a year now, it has never given me this problem before. Also i share this modem with another cpu that is in another room connected wireless I noticed the same thing happened to the connection. can anyone help?