Script for dis/enabling wwan interface

Hi guys,   I'm searching for solution to disable and enable daily the wwan interface on the Fortigate 30E The appliance is running on 6.0.12 firmware.. On 6.4 I can use automation under securitya speed test nd schedule disabling and enabling wwan interface.... On 6.0 auto-script seems to be my only option e showbox xcept te script stops running when log output size is exceeded   Someone any idea?