Try rebooting your modem and see if that fixes it. If not, try this in order: 1. Power off all devices connected to the modem via wifi or ethernet cable. 2. Power off the modem by unplugging the power cord from the wall. 3. Wait 60 seconds, then plug the modem's power cord back into the wall. 4. Wait another 60 seconds or so and repower your devices.
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