Help! Is there a limit to number of wireless devices defined in the FIOS router?

My current settings:
I have an Actiontec MI242WR router at home for my FIOS Internet/TV connections.  Security setting in the router is set to WPA2 and SSID broadcast is set to 'Disabled'. We've had this router for a number of years and everything seems to work fine.
My issue:
Currently, I have 10 wireless devices defined in the router, set to be the only devices accepted by the router. they are all normal devices such as laptops, printers, smartphones, etc, defined through menus (Wireless settings/Advanced security settings/wireless MAC authentication).
They all work fine but it seems when I add a new wireless device, it drops one of the previously defined devices from the list. Can't remember if drops the last or the first one previously defined. I'm trying to add about three or four more wireless devices to the list but can't afford to drop any of the other ones. Is this a limitation of this router? Am I doing something wrong? Do I need to buy my own router to replace it with? Thanks for your help in advance
Solved!
Go to Solution.

#1 With MAC Address filtering there are the following problems/issues:
a) Regardless of the type of encryption (Wireless encryption types include WEP, WPA, WPA2) MAC Address(es) are always sent in the clear!
b) Not only it is possible to spoof/clone a MAC address in a NAT router..
For example as noted as shown at http://ui.linksys.com/files/WRT54G/v8/8.00.0/WanMAC.htm
..it is also possible to spoof/clone the MAC Address on a computer!
c) If an attacker user does not know how to spoof/clone a MAC address without encryption: While they can not use your network, they can see what you are doing!
#2 So just use the highest level of wireless encryption that all of your gear supports.
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