Below are some possible causes of weak signal and solutions to try improve it:

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1. Place your router in an open area close to the center of your home
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2. Check for interferences from microwaves, cordless phones or other home appliances
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3. Check your router's settings for optimal performance
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4. Update your router's firmware
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5. Try changing the wireless technology your router is broadcasting
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6. Try changing the channel
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7. Sometimes resetting your router can help improve the signal