Router Keeps Limiting Speed

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I am using an ASUS AC1750_B1 (Firmware: 3.0.0.4.380_7743-g2cf84e9) router on COX internet. Ever since I got this router it has had an issue where it limits the max amount of data allowed per device to 10 MB/s. A reboot of the router would usually fix the issue and it would return to its usual speed. Slowly though, the intervals between when the limit would happen shortened. Now it is at the point where neither rebooting it through the router's settings or by shutting it off fix the problem anymore. Firmware is up to date and data limiting is off so I have no idea what could be causing the issue. plz help ;-;