AOL or its BB modem doesn't necessarily render all other USB ports useless. The problem probably lies somewhere else.
Further info would be useful: What operating system are you using? Is your BB modem plugged into a USB port in your PC, or into a port on a USB extension hub? When the connection is lost, how many of the green lights on the modem go off? Have you got filters on ALL your other in-use phone sockets in the house?