Hi, after some time, sometimes after few minutes, sometimes after a day, download speed drops and keeps not more than 260Mbps while right after gateway restart I am able to reach 400-600Mbps, the biggest strange here that it is always stays around 250-260Mbps. And it is no matter if it is peak time of the day, or middle night, same situation.
Upload speed is stable and stays at 120-140Mbps all the time.
Signal quality, CA bands and all other signal parameters is pretty the same before and after the restart. Reboot of modem usually doesn't help, only whole gateway restart brings speed back.
Also "Signal quality" is always static number -51, it doesn't change even when snowing.