This is pretty common problem now. I collected some of the threads here. Seems like with stay home activity, their network is even more out of capacity than before: https://forums.cox.com/forum_home/internet_forum/f/internet-forum/25320/ping-packet-loss-megathread
I've been also talking with customer support for couple of days now, sending them dozens of trace routers and pings. Their customer support rep has been mostly confused and asking about what the nodes are and if they are part of my network (they are not, they are part of their network). They sent one technician over who said there is nothing wrong in the signal, that likely the Cox network is over 100% capacity.
One person did a FCC complaint that resulted to call from Cox Executive Office, basically saying that the node is over saturated and they need to upgrade the node: forums.cox.com/.../98850
