Linksys Wireless Router :: E4200 / 192.168.0.1 Modem Page Unreachable

Once in a while, I lose Internet connection and at the same time cannot reach my Siemens Speetstream 4100b DSL modem's setup page 192.168.0.1 ; it happened again this morning (from both wired and wirelessy connected computers). When I go to the router's setup page 192.168.1.1 , it would usually in that situation show that the router has not acquired the Internet IP Address; I power-recycle (a few times) both modem and router and eventually the router reports that it has acquired the Internet IP Address, but there is still no Internet, and the DSL modem's setup page 192.168.0.1 is unreacheable.The situation usually self-resolves only in an hour or so after the time the router has acquired the Internet IP Address: Internet starts working, and the DSL modem's setup page 192.168.0.1 becomes reacheable.