Moving platforms reversed velocity whenever |x-startX|>range, which stays true for several frames after the flip, so direction flipped every frame and the platform vibrated in place. Now reverse only when past the edge AND still heading outward. Same directional guard for enemy 'bug' patrol. Added a 6px deadzone to 'mev_bot' so it stops shaking when aligned with the player. Verified: a moving platform now flips ~4x over 360 frames and travels the full range symmetrically.