Packet Loss still continues....

Good afternoon, this is a followup for further help. I've been getting packet loss on multiple devices, using both wireless and hard-wired LAN connections for several years now. I have replaced all my cables including both CAT6A and RG6, done factory resets, purchased a new router, purchased new modems, tried different PCs,  rebooted the modem and router etc. I have followed all the telephone-support Comcast requests as well such as restarting modem etc. The problem is the same, constant consistent packet loss similar to what is shown below. Quite recently it has been around 5% (images from today). The last technician told me to buy a new modem, which I did, and the packet loss problem still exists (I've tried 4 modems). Packet loss always occurs and creates an intermittent connection. Someone please help! (I've had poor internet and packet loss for years)