I had a rough landing in wet grass (would call it a crash but no visible damage), and when I got to the quad the ESCs were beeping. Shortly after I was able to take off, but no yaw control and then it flipped (first time ever, normally its dead on). Since then I can't even take off.
I've been working it on the bench, and I can start up, and control all the motors no problem without props. Holding it on the ground with props on, I push the stick to each corner to test that each motor lifts as expected. Some motors are nice and steady and will produce steady lift, while several will lift and then slow down, then lift again etc. If I let go at low rpm and try to steer, the quad will go forward, regardless of stick input.
I've checked the sensors, and each responds as expected (I graphed the output, and checked accel and gyro responses, which were normal).
Any thoughts on what could be wrong? I have 4 esc/motors spares, but I am hesitant to just replace it all without knowing what might be the issue. Any suggestions would be great.