I couldn't find any posts about this, so forgive me if this has been addressed.

Almost every night, usually sometime between probably 1 am and 3 am Subeta time (I'm in PST so from like 10-midnight), every NPC shop will be empty and say, "Sorry, there are no items stocked." As I said, this happens almost every night and lasts for an undetermined amount of time. Tonight, some shops restocked a few items within ten minutes, while others remain empty. I'm sorry I don't have more specific data on which shops/when/for how long, but it is absolutely a pattern I've noticed.

I don't know if this is intentional or if other people experience it, but I just wanted to put it out there! I basically don't do quests during this time because I know I'll have to pay inflated user shop prices for some items instead of just buying them from NPC shops.

[edit] Another detail I forgot to mention: Even when shops do begin restocking again, there are often only five or so items—much fewer than would be there in a normal restock.

I've been wondering about that too! But it's been nice, the whole "you have to wait 5 seconds between purchases" thing doesn't seem to be an issue when the stores are down.

So are some of the shops stocked for you then?? Over the past 10-20 minutes a few of them have stocked for me, but only like a third of the stock they'd usually have.

Maybe that means it's just a general glitch in the shop coding or whatever...

They are stocked but, like you say, it's minimal.

This is still happening for me... I haven't heard any updates about it. Is it still happening for others as well?

This used to be an intentional thing to sort of reset the shops. It's probably still intentional, but it would be nice to have confirmation.

For me, the shops still empty every night at 2 am Subeta time. They seem to restock faster than they used to, though.