To check for network congestion, consider the following steps:

1. Check the status of your router: Make sure the devices connected to your router are functioning properly and the router is using the most up-to-date drivers.
   
2. Check your speed and bandwidth: Using a tool like a speed test can help you find out how much bandwidth your network is using. If it’s using too much, this could be the cause of your network congestion.
3. Check what applications are running: Identify which applications are continuing to run on your network, or consuming too much of your bandwidth, and determine if they are necessary.