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Verify that the Wii Remote's pointer lens is free of obstructions and contamination (stickers, heavy smudges, etc.). The pointer lens is the tinted rectangle at the end of the Wii Remote.
Try using another Wii Remote, if possible, and check to see if you experience the same problem.
If only one Wii Remote is not responding correctly, there is likely a problem with the Wii Remote.
If more than one Wii Remote is not responding correctly, or if you only have one Wii Remote, please continue with troubleshooting.
Check the Directional Sensor Functionality by turning the Wii Remote upside down so that the buttons face the ground. If the cursor doesn't point down, this indicates a problem with the motion sensor in the Wii Remote.
Verify that there are no bright light sources, including sunlight, behind or near the TV, shining towards the Wii Remote or reflecting off the TV screen. Also verify there are no heat sources (such as electric, propane or kerosene heaters, flames from fireplaces or candles, stoves, etc.). If there are bright lights shinning directly behind the TV or on the screen, turn the lights off.
Make sure that the Sensor Bar is setup correctly:
Check the cord on the Sensor Bar for any frayed wires or kinks, and verify that the Sensor Bar is free of obstructions.
Verify that the Wii Remote is being used between 3 and 8 feet directly in front of the TV, and that the Sensor Bar is placed properly (see Sensor Bar setup).
Make sure that the Sensor Bar sensitivity is properly set:
The Sensor Bar sensitivity determines the distance the player can be from the TV. If you move out of the range of the Sensor Bar the cursor can become erratic. For information on adjusting the Sensor Bar sensitivity, click here.
The higher the sensitivity is set, the more susceptible the Sensor Bar is to light and infrared heat sources. Make sure there are no bright light sources, including sunlight, behind or near the TV, shining towards the remote or reflecting off the TV screen. Also check that there are no infrared heat sources (e.g., electric, propane or kerosene heaters, flames from fireplaces or candles, stoves, etc.).
Verify Sensitivity Setting dots:
Go to the Sensor Bar's sensitivity setting in the Wii menu (click here for directions on accessing this feature).
If only one or no dots appear on the sensitivity screen, there is likely a problem with the Sensor Bar.
If there are more than two dots, then it appears there is an additional light or heat source being picked up by the Wii Remote. Try turning off or blocking these light sources.
If both dots appear and the erratic behavior continues even when you move closer to the TV, there is likely a problem with the Wii console and it will need to be repaired.