I purchased this model modem back in 2020 however i was getting extreme packet loss on LAN, ran through all the standard troubleshooting (cables, firmware, reset, connected to different RCD power circuit, different computer) Wireless worked a treat, no problems at all, i took the modem back to the store i purchased it from and swapped it under warranty however the new modem had the same problem too 

i opted to just hold onto it as a test modem for ISP's to satiate their hunger for faulty modems however recently I've started using it again in a new house with an entirely new PC that wasn't imaged from the old OS and has limited software installed on it as is. 

Wondering if this problem has been encountered before and if know of a fix?