Can you post a screenshot of signal levels from the modem? You should find them at »192.168.0.1
or 192.168.1.1 Although they may be blocked since you say it's a Business Class account.
Can you also post some screenshots from speedtest sites? »www.speedtest.net
will work for now.--
If it's important, back it up... twice. Even 99.999% availability isn't enough sometimes.