Disconnected my Online Game, and from Discord every day

So every day I play online (Rainbow Six Seige, and often on Discord) with my friend.

Recently (last month or so)  I get disconnected from the game - in-game screen message reads "JITTER" in red on the R6 screen, and then after about 20 seconds, the game disconnects me from the server. If I am using Discord comms as well, that also goes off.

Once I reconnect to the game and discord, all is OK (until the next time).

Conclusion: It cannot be game related, or GPU or CPU related, so I assume it must be the internet that goes off somehow and then comes back on.

I have the HUB5 router giving me speeds of 897Mbps down and 105 Mpbs up, so speed itself isn't the issue.

Tomorrow, I will take the router offline and try again but I suspect maybe the router or cabling is the issue?

Any ideas as to a solution folks?