Does the replication work cross-region, say US-East and US-West? or even cross continent? It sounds like the timing requires very short latency and might not work in these scenarios
In these cases you can help the cluster out by following some of the advice on the "Recommended Production Settings" page (https://www.cockroachlabs.com/docs/recommended-production-se...) around specifying which `--locality` each node is in.