Did CCP change the agro vs drones in the last update?

Im an alpha and I pulled out my Thorax to hit a DeD 4of10 site. And all the drones I had were killed in 5 mins.

I was working on the battle ships with my guns and and my drones were keeping the frigs off me at a short rang of 10k. I was keeping the battleship at 20k. And every time I looked I was missing 3 or 4 drones. Went through 17 drones.

Sometimes drones are weird. Warp off to a safespot, eject from your ship, and get back in. Usually this will fix it.