Wireless Network drops out

Cisco Business router rvo42g.       Linksys wap4400 Access Points.

Access points keep droping out.  We have 4 access points and the signal shows strong.   SSID is correct, channel is the same on all of them.  Security is the same on all of them.

It shows a strong signal and when the computer access it, I shows limited connection or drops.  Sometimes a strong signal and  drops out.  Checked the lease time and that is ok.  Just started doing this.
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Check with one AP only (turn other 3 off). Check if it still drops out.
Does it happens on all wireless devices or just one?  If all the devices then it points to the AP.  If just a few devices then it can be due to a network card.  For example, early iPads were known to be very finicky with the AP it's connected to.  I also have experience with laptops where it shows strong connectivity signal but couldn't connect to a VPN but was ok using ethernet.
AkinsdNetwork AdministratorCommented:
channel is the same on all of them.
The channel shouldn't be the same on all of them. You may be better of with auto settings unless you want to manually measure RFs in the environment

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I wonder about that too.  Why set the channel as static when you can have it in auto.
GeorgeidpAuthor Commented:
i tried all the suggestions, and from what you said I might have to look for new access points.  We had these 6 years.  It happens to all computers that are wireless.  Sometimes I can stay on for an hour.

tried each  ap separately.  Checked the router also
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Wireless Networking

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