Normal stuff you find in your home can interfere with your wireless signal. Interference is the most common cause of weak or dropped wireless connections.
Many common household devices can interfere with the strength of your wireless connection.
Examples: Cordless phones (2.4 GHz), cell phones, Bluetooth devices, televisions, dimmer switches, fans, fluorescent lights, copy machines, microwaves, treadmills, wireless surveillance systems, wireless speakers, wireless baby monitors, motion detector lights, garage door openers
Try turning off (and unplugging) electronic devices in your home. If that solves the problem (but you still need to use the devices), try moving your modem so it and the other devices aren't in the same line of sight. In some cases, you may need to separate devices by as much as 5 to 10 feet before you see consistent improvement.
If you live in an apartment complex, or other similar dwelling, it's possible to pick up interference from nearby networks. If that's what happening in your situation, changing your modem's channel might solve the problem. Many wireless networks operate on channel 6, but channels 1 through 11 are available.
Once you've made the necessary changes, restart your computer to see if your connection is strong and steady. If it's not, try adjusting your device's setup or relocating your modem.