dhcp IP address gets deassigned

[rak14]

Hi,

Board: NXP S32K148

Code: RTM 4.0.2 Lwip example 

I'm able to enable the DHCP and hostname also pings works by resolving the hostname.

But after sometime it's showing Request timeout and then destination host unreachable.

What is the reason for this & how can I resolve the same?

Thanks 

Rak