1. **Interference**: Other electronic devices in your house, such as microwaves, cordless phones, or baby monitors, can interfere with your WiFi signal and reduce its strength. Try relocating your router away from such devices or changing the channel on which your WiFi network operates.

2. **Physical Obstructions**: Walls, floors, and large furniture can block or weaken the WiFi signal as it travels through your house. Consider repositioning your router to a more central location or investing in WiFi range extenders to improve coverage in all areas of your home.

3. **Router Placement**: Placing your router near metal objects or in enclosed spaces can hinder its signal strength. Ensure that your router is positioned in an open area, away from walls and obstructions, for optimal performance.

4. **Outdated Equipment**: If your router is old or outdated, it may not be capable of providing the best WiFi speeds and coverage. Consider upgrading to a newer model that supports the latest WiFi standards for improved performance.

5. **Network Overload**: Having multiple devices connected to your WiFi network simultaneously can overwhelm the router and lead to slower speeds for each device. Limit the number of connected devices or invest in a router with better capacity to handle multiple connections.

6. **WiFi Interference from Neighbours**: If you live in a dense urban area or an apartment building, the WiFi signals from neighbouring networks could interfere with your own network. Changing the channel on your router could help minimize this interference.

7. **ISP Issues**: Sometimes, the problem may not lie with your WiFi setup but with your Internet Service Provider (ISP). Contact your ISP to check for any outages in your area or to troubleshoot any connectivity issues on their end.

8. **Software and Firmware Updates**: Ensuring that your router’s software and firmware are up to date is essential for optimal performance. Check for updates regularly and install them to address any known issues and improve overall performance.

By addressing these common issues, you may be able to improve the WiFi signal in your house and enjoy faster, more reliable internet connectivity. If problems persist, you may want to consider consulting with a professional IT technician or your ISP for further assistance.