Why Do We Need to Restart Modems/Routers?

A modem/router is a very small computer that has a very limited amount of memory and processing power compared to a normal computer. Your modem/router performs a lot of complex tasks to make sure that the right data gets to the right computer at the right time as efficientley as possible.

Like a computer, there are many different problems that can occur many of which can be fixed by restarting the device.

A Technical Explanation

Over time many of the connections opened in the modem/router, to send data to and fro, can stay open for a while on the router consuming memory and /or using processor cycles. After a while (and perhaps even after certain operations) the modem/router may run into bugs or loops or operations that slow things down. As you push more data through a modem/router it can run out of memory, or encounter a bug that freezes the routers opreating system, or even overheats the processor.


An Anecdote

Imagine about a quarter of the way through a game of chess, someone makes an incorrect move which is not spotted by either player. Say they take another piece with their pawn by moving forward (rather than diagonally). Many moves later, one of the players realises what has happened. Clearly the game cannot continue to an adequate conclusion if there was an incorrect move made (and once the incorrect move has been made we can assume that each move made after it was incorrect in some way), so the mistake needs to be rectified. The two options are either to reverse each move, taking us back to the mistake and rectifying it this way, or completely restarting the game. Each solution would lead to a satisfactory conclusion for the game, however completely restarting the game is more time efficient, more accurate and less onerous.

In a similar way, when you restart a computer or a modem/router, you are essentially allowing the device to restart the chess game to fix whichever mistake was made in the past.

In a chess game the person who made the error can be more careful next time & avoid the problem but a computer or modem/router (unlike a chess player) does not learn from this error so if exactly the same thing happens again, it will impair the router/modems efficiency again thus requiring another restart.

Too Often?

Sometimes your modem/router may need restarting "too often", this can sometimes be caused by a temporary internet connectivity issue or also by a variety of other issues including perhaps the modem/router being faulty. Some people put an electronic timer on their modem/router and other electronic devices to turn them off and on again on a daily basis. We would regard anything more often that this as unusual and if your modem/router was requiring to be restarted too often for reasons other than temporary internet connectivity issue further action beyond the troubleshooting steps below may need to be taken.

Troubleshooting Steps

Check that the power supply is stable, check the power supply adaptor is firmly in place, there is no damage to the power supply cables and the power supply adaptor is not overheating.

Check that the modem/router is not overheating. Your modem/router must be positioned in a clear well ventelated space. An overheating modem/router will not only not work efficentley but the overheating will reduce the overall life of the device.

Restart the device by unplugging the unit from the power source for at least on minute and then reconencting the power source to the unit and waiting a few minutes for the unit to complete its restart and reconnect process.

If these steps do not resolve the problem please phone us on 0800 NETSPEED (0800 638 773) for assistance.

Please note that we can only assist with internet connectivity problems, if you are experiencing problems operating your computer please contact your local computer technician.


Do not remove the Power or Ethernet plugs from the sockets in the devices unless you are sure that you can reconnect them again in the correct sequence. Reconnecting a device incorrectly may result in loss of your internet connection, loss of functionality of the device or damage to the device.

NEVER Press the reset button on any NetSpeed supplied device unless specifically instructed to do so by a NetSpeed technician. Resetting a device may result in loss of your internet connection or loss of functionality of the device.

If we need to visit to reconfigure or replace reset or damaged devices our callout fee and the cost of any damaged devices that need to be replaced will be charged to your account accordingly.