Connection between LAN and Wireless lost

[plbartie]

I've got a Tenda wireless router, I have a couple of PC's setup in my home network. Some connected over LAN and some over WIFI.
Every now and then the connection between the wireless and wired pc are lost. All pc's can then connect to the internet but only the wired pcs can see each other and same with wireless.The only way I have found to get it to work again is to reset my router and configure everything from the start. Now the only setting I change on the router is the ADSL connection and then the wireless network (SSID and Password). I've read something about bridging the 2 connections on the router but there is no setting for that on the router, i've checked.
Any suggestions as to what might be causing this and how I can fix it?

 

[SilverNodashi]

are the Wireless PC's and wired PC's on the same IP subnet?
How do you assign IP's to the PC's?
How is the Wireless & LAN connected, physically?

 

[plbartie]

are the Wireless PC's and wired PC's on the same IP subnet?
How do you assign IP's to the PC's?
How is the Wireless & LAN connected, physically?

IP's are automatically assigned and the Router has 4 LAN ports built in.

 

[deepdiver]

OK what should be happening here is wireless range and wired range should be the same.
ie 192.168.0.1 -254
First check that.
Then check that both have the same default gateway ie the router (192.168.0.254)
when you have the issue again try and tracert out onto the net ie www.google.co.za
see where the wired goes and see where the wireless goes.
try and ping wireless and wired.
once you have done this post your results.
also try and give the ip ranges for wireless and wired.
They will be a private range ie 192.168.0.0/24 or 10.0.0.0 so don't worry about writing them down as we won't know your outside address(don't post ADSL address please)
otherwise this could just be a firmware issue have had that quite often, normally fixed by upgrading firmware.