How about sys light when it stops? Upgrade the latest firmware, reset it and reconfigure it to see what happens.

I also am experiencing the same thing and I have updated firmware to latest but still the unit disconnects after some time and has to be reset!

unit disconnects after some time and has to be reset!

How is your connection with router wired or radio?

jimasek wrote

How is your connection with router wired or radio?

It is Wired. ADSL connection through Modem

Can you tell me what is your Network / WAN Connection Type as there are some option such as " Max Idle Time" which can explain this behavior.

Also make sure that you have the latest firmware installed according to this page as there are several fix in the latest firmware : http://www.tp-link.us/support/download/?model=TL-WR841N

Can your other wireless client devices find the wifi SSID ?

I have exactly the same problem with the same router, only I have firmware 3.13.9 Build 120201 Rel.54965n because I have just updated today.

I tried everything I could.
Restore to factory, restart everything, checking the cables. Pinging the gateway was successfull.

I'm connected with a pc as wired and with a laptop as wireless. The whole network is lost after every one hour or so, as both devices loses the network. There is nothing unusual on system lights. I have to reboot or restart the router and then everything's fine for another hour or so.

I had no problem at all with this router for 2 years. But this is getting frustrating now. Any idea?

I had this kind of problem with my new WDR4900 and the initial firmware.
As it disappeared after an upgrade, I think it's a bug into the firmware...

Firmware Version:
3.12.25 Build 130322 Rel.33803n
Hardware Version:
WR842ND v1 0000000

Lost WAN connectivity on workstation adjacent to router electrically.
Lights on all ports flashing wildly.
Power reset restores functionality.

Firmware Version:
3.12.25 Build 130322 Rel.33803n
Hardware Version:
WR842ND v1 00000000
LAN
MAC Address:
90-F6-52-2B-64-72
IP Address:
192.168.0.1
Subnet Mask:
255.255.255.0
Wireless
Wireless Radio: Enable
Name (SSID): lsnet
Channel: Auto (Current channel 9)
Mode: 11bgn mixed
Channel Width: Automatic
Max Tx Rate: 300Mbps
MAC Address: 90-F6-52-2B-64-72
WDS Status: Disable
WAN
MAC Address: 90-F6-52-2B-64-73
IP Address: 70.167.242.236 Static IP
Subnet Mask: 255.255.255.224
Default Gateway: 70.167.242.225
DNS Server: 68.105.28.16 , 68.105.29.12
Traffic Statistics
Received Sent
Bytes: 311905519 1371463910
Packets: 2053696 2102298
System Up Time:
0 days 09:48:16