Zenith Daytona 16520 caliber 4030 power reserve question

[Lalaji]

Dear friends,

There is something regarding the 16520 movement needing your experience sharing and expert advice please.

I recently bought an 16520 and had it returned to the shop for checking after a day because it kept stopping. The shop had it serviced and passed it back to me.

Since I got back the watch, the watch seems moving just fine. But then I found an issue which I don't know if this is normal for this caliber.

The watch seems moving fine for about 5x hours if i manually wind it fully. However, if I just manual wind say around 10 times at the start of the day and leave it self wind for the rest of the day (an around 5000 steps walking days only), the watch seems stopping rather soon. There was a day which the watch stopped at 10pm and another day stoped at 4am when I both left the watch still at around 7pm after work.

This never happens to my other watches. No matter how little I move that day, my other watches can always keep moving until next morning.

It seems to me this watch does not wind well automatically. Is this the characteristics of this 4030 caliber? Or it sounds like a problem with this watch and I should have it serviced again?

Thanks for any experience sharing