One imac works on lan but not other

Our LAN is based on a combination Motorola cable modem and router that provides WiFi and 4 ethernet ports. Our two iMACs and an iPOD, as well as two printers, have been connected to the LAN over WiFi, using the Airport setup. This arrangement generally has worked well, though resetting the router has to be done more often than I think is normal. A few days ago, I began using an Ethernet cable to connect one of the iMACs since it sits next to the router. Since then that computer (computer A) has never dropped off the LAN as it sometimes did. However, the other computer (computer B) is having some odd problems. For example, when computer A is running, computer B cannot send or receive emails, though it connects to the Web satisfactorily. It still is necessary to sometimes reset the router in order for computer B to connect to the LAN. I suspect that the LAN setup on one or both computers is at fault but have no idea what to look for or to change. The iPOD seems not to have any new problems, though it never has consistently detected the LAN; this problem seems to be mostly due to the location of the iPOD relative to the router.
Any suggestions would be welcome. Thanks.

The router is only two months old. I switched my computer (computer A) back to connecting to the LAN via WiFi and my wife said the problems with her computer went away. I certainly can continue to use WiFi to connect to the LAN if that is what is needed but using the Ethernet cable did prove to be a bit more reliable for my computer. Again, any other ideas will be appreciated.

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One imac works on lan but not other

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