Another suggestion is it possible that your modem and/or router needs to be reset and/or updated. Try these simple fixes:
1) Power cycle your modem. Unplug the power to your modem, wait one minute and then plug the power back in (AND also remove the battery if you have one). You may need to wait up to several minutes for the Internet light to turn solid green and start working.
2) Reset your modem to its factory default settings. Be sure you read your manual before resetting your modem. You do not want to accidentally erase network information you need, and doing a reset clears out any custom settings you have programmed into your device including: static IP entries, DNS, customized admin password, customized wireless settings, port forwarding, routing and DHCP settings.
3) Update your firmware. Firmware is the software that runs your modem, and it can become old, obsolete and/or corrupt. Check if there's an update for your device and then download any recommended software fixes. (If your device is not listed, go to the device manufacturer's website for more information.)
4) Power down your router for 1 minute and re-boot. Also power down your switch boxes for one minute if you have any.
5) Review what else is going on on you network when you experience the signal dropouts. Is your phone ringing? Are there are other users on your network watching a video or downloading a large file?