Never felt that on ours. From memory it sometimes felt like they'd delay a tad when trying to move an almost jammed motor (say bringing Tormenta 1's lifter down after hoisting the sofa), but nothing like you described.

Check your rx isn't being starved of power, if you're running a BEC. If the battery is discharged, or being too heavily stressed by the drive motors, the BEC might not keep the rx alive and so it'll failsafe. Once it "comes back on line" after the battery has recovered, it may take a moment to rebind, which might be delay you're feeling.

Just a thought.