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You haven't mentioned which wireless router you are using. Is it netgear or Linksys or some cheap router?
Is the firmware of your wireless router updated? Upgrading to the latest version of the firmware can solve the issue. Check to see if there is any update available and try it.
If this doesn't work, check to see if there is any interference like TV, micro-oven,fluorescent bulbs etc in your room? They can interfere your wireless connectivity so make sure that your wireless devices are away from these sources of electrical interferences.
Since, you both seem to use the same wireless router, there could be clash between your laptop devices. So change the channel on your wireless router and make sure that you both are using different channels on the router.
Sometimes changing the power output settings of your router can solve the issue. If the settings in your wireless router can be modified by some customer firware, you may increase or decrease the power to get the optimum signal. For better coverage, just increase the standard output level. However, this will add more noise to the signal which may slow down the connection speeds.
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