Connection to the portal is lost every 5 to 10 sec when trying to use virtual services from Manage tab or the data sheets for data driven virtual services. Need to login several times when trying to update the data sheet or deploy the virtual service from the portal.
Taking more time to load the files under Project folder and causing the issue.
DevTest 10.3, 10.4
If anyone facing the same or similar issue, support might have a patch. Please open a support case and refer DE393784 & DE414876.