I've noticed during my Krastorio 2 play through that Requester Depots will stop sending out drones to collect resources from Supply Depots. Picking up and replacing the depot seems to fix the issue. I'll come across builds that aren't functioning because one of the requesters wont send out drones.

Can you provide a save game?
What version of the mod are you running?

Version is 0.6.4

where should I send the savegame?

Can you first try updating to the latest version

when no drones are sent, the problem often was fuel: either that depots were not supplied by you fast enough with enough fuel, or an old bug (something like fuel dropping below the amount to send drones, but not asking for new fuel yet) that has been fixed many versions (with up to several versions per day, this can mean a single or a few days only :-) ago.

seems to be resolved wit update, fuel drones weren't being sent it looks like. Thanks for the amazing updates.