Which TM router are you refering to?

If its the DIR-615 invariably there are 2 things you need to be aware of :-

1. Wide channel does not work well with iPhones and the likes cos its not supported.

2. Because of the compact design n components used (I suspect) the router tends to be poor at dissipating heat that builds up. Turn off the wifi and connect in bridge mode whatever router you prefer (or convert to VLAN switch). Less work load on router = less heat generated.

Based on my tests with the router over 6 months now I do not see issues like WAN disconnects etc. There are good third party stuff out there eg. RB products but its not that bad TM supplied router. And by the way, do not stack the router on top of modem or near heat sources as routers tend to behave strangely when they get far too hot at components level.

The modem is fine running 24x7. Just don't stack the router or any heat source onto it and ensure some space around it for ventilation. Mine is kept in a semi-enclosed cabinet

Using DIR-615 for 6 months now 24X7. Turn off the wifi n hook whatever router you like. Seems to be working fine, no hangs and router remains cool. Don't use fan or anything and router sits inside an enclosed cabinet.

Sounds to me like wireless interference. Do you see many other wifi networks in your location? Some may be stronger and may cause you PC to drop connection with your router.

Also when you use "N" set to 20MHz narrow channel. Most 802.1n routers will use 40MHz (wide channel) which will take cause more problems. 802.1x 2.4GHz radios effectively can support only 3 networks before some interference starts. Wide channel takes 2 out of the 3.

Your other option is to move to the more expensive 5Ghz 802.1n network.

If LAN connections are affected, check to see if router and modem are placed too close together. Usually allow for space like 2 cm to 3 cm. Heat build up could be one cause. Seen this enough times with cheaper consumer routers where the heat sink or lack of it does not dissipate heat fast enough.

Could be wifi interference. If you have a 5ghz option on your router switch to that. A lot more stable speed wise. Clocked at around 215kbps all the time from my mac.