Legato Api not working

Hi,
le_ulpm_ShutDown()
Above mentioned api return LE_OK but the module not turning off .And sometimes the api works it let into module turn off condition .

Device: WP7608
Legato Version:18.06.3_72bae80dcf4e2d36453435468a5ceaa3_modified
Firmware Version: SWI9X07Y_02.16.02.00 000000 jenkins 2018/04/19 19:59:02
Bootloader Version: SWI9X07Y_02.16.02.00 000000 jenkins 2018/04/19 19:59:02
MCU Version: 002.009

Thanks in advance

how about using AT!POWERMODE command?
Also is this occuring in R13.3?

Now we are working with R16 latest version stills the issue reproduces.

how about using AT!POWERMODE command?

Not tried AT!POWERMODE still now …

This can isolate if legato app makes the problem

Okay thanks for your response .I will try AT!POWERMODE command…