Cassandra cluster still trying to reach old IP

I've seen a strange behaviour since a node decommission; regularly some Cassandra nodes start massively outputting these logs: OutboundTcpConnection.java:570 - Cannot handshake version with /10.208.58.4 The issue is that that IP matches a non Cassandra pod. It's like that IP is a leftover of an old pod, how can I solve it?