Topology: Linksys Wireless-G Router to broadband cable modem; computer A CAT5 to wireless router; computer B Linksys Wireless-G adapter; computers C and D Linksys Wireless-B adapter. The operating system for all computers is Windows XP Professional.
When computer A is first booted in the morning, the Internet connection is very slow. Disconnecting the power to the cable modem and router for 30 seconds, then restoring power, letting the cable modem reset first, then the router, corrects the connection speed. This may or may not last all day. When the Internet connection for all the computers is slow, resetting the cable modem and wireless router usually restores normal connectivity to all computers, and again this may or may not last all day. However, there are times when computer A has a good connection while the others will have slow connections. Connecting computer A directly to the cable modem results in a very fast connection with no slow-downs at all.
This problem started occurring suddenly after 4 years with the same broadband company, who performed a speed test of the connection to the cable modem, which was fine. Linksys support attempted to troubleshoot the problem with no success. Replacing the cable modem and wireless router does not resolve the problem.
Does anyone have any ideas about this?