erlang:port_command(Sock, Data, [force]) receive timeout reply frequently

We use Erlang OTP 23, and we use erlang:port_command(Sock, Data, [force]) to send socket message to game client. Read erlang doc: "the force flag:The calling process is not suspended if the port is busy, instead the port command is forced through. ". But our server receive inet_reply timeout message frequently. What reasons can cause receive timeout message when use the force flag? Thanks in advance!