New 5.8ghz cordless phone, router issues

I've had a Linksys BSFR41 router for several years.  Has worked fine.  Last year I hung a WRT54GS wireless router off of it, to connect to a computer down the hall.   Has worked fine.   Last month I got a new Panasonic 5.8ghz cordless phone, which sits near the BSFR41.  More recently, for the last week (approx), the BSFR41 has been going offline (red DIAG light comes on).   I'm going to rerun all the wiring to see if that would help.  

My question is, should I be concerned about the phone interfering with the operation of the router?  And if that's an issue, is there anything I can do about it?

Any help with this would be appreciated.

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IanThConnect With a Mentor Commented:
5.8ghz is actually 802.11a I think

channel 11 is usually a slave off one of the others
select a different channel for your wireless router

channel 1 usually conflicts with dect/cordless phones
codequestAuthor Commented:
Thanks for input.  

I realize that this may be very device specific:  If I change the channel on the wireless, does that mean I'll have to redo the security between the wireless and the two devices that talk to it?

The wireless router is set for channel 11 now, and since the phone is 5.8 ghz, I'm going to play with the wiring first.  I realize that I had diddled my laptop cable about the time the errors started occurring.   If no joy there, I'll try the channel change.
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codequestAuthor Commented:
Thanks, I'll poke around with it.
codequestAuthor Commented:
I took the wireless router out of the network and still had intermittent failures with the BESFR41 wired router.   I worked on it for a good while trying to isolate whether the phone was interfering with the router...neither Panasonic nor Linksys had any reports of a 5.8ghz phone interfering with a wired router, and I ran out of time to do a conclusive problem isolation test.  Deciding I wanted to keep the phone in either case, I swapped the wireless router in to serve as the primary router and the problem went away.  

I may never know if it was my phone, the wired router, or the combination, but after six hours of crawling around swapping wires, I'm done!  

Thanks for the prompts to look at the problem in different ways.
no worries I am a computer support engineer so I am used to doing that
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