I recently changed ISP from AT&T U-Verse to Charter Business. Charter convinced me that my U-Verse 12 Mbps wasn't sufficient to run all of the connections in our office. I installed Charter 100Mbps and the desktops seemed slower. Tested using speedtest.net and each pc averaged 8.6Mbps. Reconnected the U-Verse modem and each pc is averaging 11.3Mbps. How is that possible? Is there a solution?