Hi Prasun! this was a problem also on Centos7, maybe it just not happened to you before (in my case was a changing of enumeration between motherboard SATA controller and HBA). with the increasing number of devices the “resolving” of devices to a logical name can become non-sequential and as such it will change between reboots. The general recommendation (even for md raid volumes) is to use UUIDs in fstab.
Check partition UUID with blkid command and use that UUID instead of a /dev/ path, this will give you a guaranteed mapping (as is not possible to have multiple partitions with the same UUID).