Modem failure

modem failureMy encore modem is hooked to a Qwest dsl line.  I don't know the model, I am using free yfi at panera's, for the last weekthe modem dsl light stayes lit for about a minute then goes off, and I am can't get on the web server.  I unplug the modem power for 2 mn. then replug the lights light up and I can connect the the dsl again.  In about aa minute or two the same thing happens.  When I pluge it in the dsl light flashes several times before staying on contunlly.