While performing an Agent deployment to a group of target machines, at certain point DSM Explorer enters into a "Not Responding" state, causing that the ongoing deployments are lost (regardless if they are in OK or Failure state):
When a deployment is made to large group of target machines, in some cases may be a lack of validation of what those IPs correspond to.
This problem may occur when one or more IPs on the target group belongs to a non-computer machine, like a Printer or Scanner, causing this problem to happen.
Based on network configuration, is possible to isolate the issue trying to send the Agent package only to that Pinter/Scanner machine and checking what the Deployment Wizard's scanner shows:
Removing the non-computer device from the target group will solve the problem.