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Memory errors in network devices often cause this type of connectivity problem. So first, to rule out that possibility, power down the router/modem that provides your Internet access and unplug the power cord and remove the battery from the router/modem as well. Wait 3 minutes for the device memory to drain (which will remove any erroneous data). Then reinstall the battery if it has one, plug in the power cord on the router/modem and power up the device. Wait for the router/modem to completely start up. Then do the same with your WiFi router (if you have a separate WiFi router rather than a modem that provides both routing and WiFi). Then power down the cable box (unplug power), wait 3 minutes and plug power back in after the router/modem has completed start up and test to see if the issue is resolved.
Also make sure to plug the cable box directly into a wall socket and not into a power strip or surge protector when you do this.