How about when a drone die they drop a 95% durabilety drone of same sort then 90% etc etc or 90%-80% or evern 75%-50% or 50%-Gone?
And they can be repaired?

Sure, if you want drones to be nerfed in just about every single stat accordingly.

Sounds good on paper, but thats basically making drones invincible if all you have to do is dock and repair them every so often. What would happen to the price of drones?

How about this.

When drones die they become a damaged type of that drone.

When you have a damaged drone it will not fire but it has 100% resist to all damage types, they also become much smaller and ethereal.

S I lay a DWO Drone and it dies, it turns into a Damaged DWO Drone, the damaged DWO will not block shots but cannot be damaged further. Damaged drones can be scooped and repaired at an ai base just likely other gear. Or they can be repaired with scrap parts on the go.

Perhaps they could just be unrepairable. Droners would stay useful even after multiple deaths while the market won't be flooded with all the drones. Eventually they would blow up, but when your going on a run you'll clearly take the drones that won't blow up yet.

This is correct: drones have weighting balance levels far over anything else a player can use, and there has to be a potential down side.

Just make drones a lil bit cheaper.

make BFD's fire ares laser and use a fist of light instead :p

Something like this is surely a possibility, but I don't really see a strong reason to make this change without a bigger context.