It is often very difficult to determine if the modem-router is at fault (unstable, corrupted OS, etc.) or if the problem is caused by the ISP (throttled streaming, downgraded service, etc.). Thus, IT folks always suggest to "reset" the device, which often seems to correct the problem. In this case, the "reset" performs two functions. It clears any faults in the modem-router's operation, restoring all parameters; and reestablishes the ISP connection, restoring the identity and service subscription of the customer. And thus, download speeds and stable service are restored.
As in many cases, "engineering solutions" to such problems can be both "simple and effective". In this case, a universal solution to both potential causes would be to install a timer, which will shut off the modem-router and then it turn back on, automatically restoring/resetting modem-router performane and ISP subscription identity. For example, set the timer to turn off the modem-router at 3am, and restart at 4am, when no one requires internet access -- or some other convenient off-on setting (and "off time duration"). In some cases, the "timer reset" may be required several times during the day, again coordinated with need for internet access. This solution is elegant, simple and automatic. And, for those concerned about the ecosystem - it may save energy and reduce greenhouse gas emmissions.
