Why does the router's blue light flash?

Possible reasons and solutions for the flashing blue light of the router:

1. The external network is disconnected
How to determine: When the network is disconnected, remove the router, Connect your computer directly to the external network to see if you can't access the Internet.
Solution: There is nothing you can do if the external network is disconnected. However, the router has a reconnection mechanism set up in the router. If it is set up, there should be no need to restart. After the external network is connected, it will be able to connect after a while.

2. The number of router connections or traffic is too large
How to determine: There is no problem with the external network, but it will still be disconnected, and no one is doing heavy traffic (P2P) downloads under the router.
Solution: Through traffic monitoring of the router, you can find computers with high traffic and stop or reduce high-speed downloads. Have you set a wireless password? Are there other people using it? This will happen if too many people are using it, especially for some unstable routes.

3, the router is unstable
How to determine: There is no problem with the external network, even if no one downloads at high speed, it will still be interrupted.
Solution: Change the router. I have found that this problem often occurs with some low-end brands of D-Link. Also, if routing is turned on for a long time, some routers with poor quality will age out.

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