Will the IS reestablish the connection with the Broker

In my message-based solution,using a Is1-Broker-IS2 architecture.The IS1 publishes messages to Broker,and IS2 subscribes messages from Broker using a trigger.The issue is,when the IS1 publishes two much,Broker is fine,but the IS2 doesn’t continue to subscribe the messages while the connection with the Broker may be fine or may be lost.I don’t know why.
I want to know why do these issues occur and how to set a reconnection time when the IS lost the connection with the Broker.