WRT54GL stops working until rebooted

I've been using my WRT54GL for years with no problems.  A few months ago, I began to see an intermittent problem, in which all devices connected to it (either wirelessly or wired) would suddenly lose access to the network.  Sometimes (but not always), one of the devices will also give a device-conflict message about there being another device using the same IP address.  In any case, the only thing that works at this point is to unplug the power from the router and restart it.
I've got the router set up for DHCP, and I do have a couple devices (a printer and a NAS) set up with static addresses outside the range of DHCP.
The only thing that I can think of that changed at the time this started happening, was that my wife installed the updates to her Macbook's OS.  And our family had a sudden influx of iPhones which connect to the router.
I've poked around in the router's settings to no avail. I've checked the release notes for the firmware updates but I don't see anything relevant.  I'm considering going rogue (to use the parlance of our times) and installing the Tomato firmware to see if it makes any difference.  But first are there any suggestions for me before I take this drastic step?
Thanks,
MJD 

When the router complains of two devices using the same IP address, it is almost always correct.  And this will almost always cause bizarre problems with your network.  You must search your network to find the conflict.  To check this out, do an "ipconfig" on each computer, or display the IP address on the device.
Note that if a device uses a static IP address, it must be outside the DHCP server range, and it cannot end in 0, 1, or 255.
If you have an unsecured wireless network, the "duplicate IP address" could be from your neighbor's computer.  To fix this, add wireless security to your network.
Sometimes duplicate IP's can be generated if the router is shut down, then soon restarted or rebooted, while wireless computers are still "connected".  To fix this, disconnect (or shut down) wireless computers, then reboot router, then reconnect wireless computers.

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