Do I need to replace my airport?

I have an older airport express at home, at least 4 years old. I have Cox high speed Internet and use it for my iPad 2 and daughters Pc laptop. The last few weeks each device is not finding our network, so I have to go I to settings and manually choose the connection, then we can get Internet connectivity half the time. the other half it says unavailable or not detected. The airport device is lit green. If I unplug it and wait a few seconds then plug it back into the wall it usually finds the connection, I'd say that works 75% of the time.
I am wondering do I need a new airport device or is it my cable/Internet connection? Thanks for any input.

Before giving up on the current AirPort Express, I would recommend that you perform a complete power recycle of your networking equipment to see if this fixes the issue you are seeing. Please post back your results.
If the problem returns, the next step that I would recommend is to have Cox run a "line check" between their service and the Broadband router that they provided you. Sometimes the signal quality to the cable modem is not up to par and could be the cause as well.
Finally, if they verify that the signal is good, then try connecting one of your computers directly to the modem via an Ethernet able. You could use the one that connects the Express to the modem. Does the problem still exist? If it does, then it could be the modem and I would ask Cox for a replacement. If not, then as you suspect it may be the AirPort Express.

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