title: serial node stops when i run for some hours
body: <p>I have three launch files that launch serial_node, when i launch this files, everything works, but after some hours (3 or more) running, the three serial_nodes stops. I try run &quot;rosnode info &quot; with my topics nodes that running serial_nodes, i get this message error:</p>
  <pre><code>Publications: 
   * /rosout [rosgraph_msgs/Log]
  
  Subscriptions: None
  
  Services: 
   * /sonar_hardware/get_loggers
   * /sonar_hardware/set_logger_level
  
  
  contacting node http://ubuntu:41025/ ...
  ERROR: Communication with node[http://ubuntu:41025/] failed!
  </code></pre>
  <p>then, i run roscleanup and launch my launch files without kill ros or change my hardware and firmware, and every works.
  I do not want to create something to monitor my topics.</p>
  <p>I'm running ROS noetic on raspberry pi with ubuntu,</p>