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LMK5B33216: 1-PPS lock with ZDM takes long time, more than 1 hour

Part Number: LMK5B33216

Hi,

I have an issue with 1-pps ZDM which takes more than 1 hour to get that. I am using 1-pps lock to DPLL3, and APLL3 lock with 48MHz TCXO with 96MHz PDF. OUT0 is 1-pps out with ZDM. OUT4 and OUT5 are 156.25MHz with PLL3 as an output source. Without ZDM mode enabled, it took less than 10 min of lock time. But once ZDM mode enabled, it took more than an hour to get it locked. I was wondering if this is normal for ZDM mode. If not, can you please send me information to try to shorten that up? Or, if you have a TicsPro file that I can try, please provide one. Here are my screenshots that I am currently using. 

Thank you.

Youngho