Try a vheap bump in the channel.

Author: kjnilsson

deps/rabbit/src/rabbit_channel.erl

@@ -485,6 +485,8 @@ update_user_state(Pid, UserState) when is_pid(Pid) ->
 init([Channel, ReaderPid, WriterPid, ConnPid, ConnName, Protocol, User, VHost,
       Capabilities, CollectorPid, LimiterPid, AmqpParams]) ->
     process_flag(trap_exit, true),
+    process_flag(min_bin_vheap_size, 46422 * 32),
+
     ?LG_PROCESS_TYPE(channel),
     ?store_proc_name({ConnName, Channel}),
     ok = pg_local:join(rabbit_channels, self()),