Turntable rotates intermittently or with jerky motion; sometimes stops under load.

Safety: Unplug the microwave before cleaning under the turntable.

User-level steps:

• Remove the glass tray and support ring.
• Clean the cavity floor thoroughly, removing any spilled food or hardened residue.
• Inspect the support ring wheels for flat spots or damage; replace if they do not roll smoothly.
• Check the coupler for cracks and ensure it fits tightly on the motor shaft.

If the turntable still moves erratically after cleaning and inspection, the turntable motor may be weak and should be replaced by a technician.