So I guess I found a way to get mostly stable network performance. Go to OBS Studio, Go to Settings > Advanced > Network > Enable networking code > Low Latency Mode Select both. Go to your CODA 4852 , disable the gateway, use a router instead, done.
So it appears that since I have the modem set in bridge mode with gateway disabled, I actually can't go back to modem menu without doing a factory reset, which doesn't seem like a prudent thing to do.