cisco 3850 stack switch does not save the configuration.

[zakir.syed11]

we have  2 cisco 3850 switches making stack , but after configuring the switch once we reboot ,  configuration goes away. 

please help me out. 

thanks 

Zakir 

[Leo Laohoo]

Do you have Kron job in the config? If you do then this is due to CSCtk68692.