Intermittent IP Address through Wireless

I am having problems maintaining an IP address to PC's connected to network through wireless.
Setup: Comcast cable modem into Linksys BEFSR11 cable router.  Three PC's connected through CAT 5 to this router.  Linksys WAP54G wireless routed connected to BEDSR11 router by CAT 5.  Three laptops + one desktop connected through the wireless router.  All working for a couple of years.
The wireless WAP54G router is located on third floor.  One desktop + one laptop is used in the basement two floors below.  This has caused some intermittent range problems.
Recent Change: Installed 6 weeks ago a Linksys WRE54G range extender in the basement to boost the signal.  Setup up and working fine.
Issue: Approximately once or twice a week one of the PC's connected through the wireless network will lose its IP address.  Most often when just rebooted.
Work-a-Round: Only way to resolve is to shut down every PC on the network (wireless or hardwired) and shutdown the extender, wireless router, & regular router.  Then restart in the order of BEFSR11, WAP54G, WRE54G.  After which all PC's can be booted and all will pickup up an IP fine.
Would like to find a solution that does not involve rebooting the entire network as this is about a 20 minutes process.  Any feedback would be helpful.  Thanks!

If earlier the connection is working fine...... check the Firmware of the Range Extender ..... Also make sure that after upgrade you will reset & reconfigure the router.....

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