Hello Anupreet,
1.VI to the host is working?
2.What is the version of VC?
3.Did you checked the connectivity between Host&VC,ping/telnet ?
4.How much time does it take the host to get disconnected from VC? What is the message that you are seing in vpxd&hostd logs exactly after the disconnection?
5. Any chance you have Connectivity issues to the storage array?