Linux

Then you're probably running NetworkManager. Stop it, or use it to configure the interface.

Thank you for ur comments, after stopping the NetworkManager service it seems to be working. I am monitoring the behavior of the interface if it gives the same problem then I will update,

can you please clarify how it worked after disabling NetworkManager, any specific reason..?

NetworkManager configures an interface. You'd need to set it up rather than use ifconfig. It seems to apply its configuration periodically, in this case is nil.

So if you've a GUI and NetworkManager, just use it to set your static IP rather than ifconfig from the command line.

There is a command-line utility for NetworkManager, nmcli, but I tend to use a GUI on the desktop and no NetworkManager on a server so I've no experience to offer about it.