The repeated input of keyboard typing is mostly caused by dust, settings or driver problems. You can follow the following steps to check: 1. Clean up dust and foreign objects in the gaps in the keyboard to avoid triggering the key; 2. Turn off the "Sticky Key" or "Filter Key" auxiliary function in the Windows system; 3. Replace the USB interface or switch wireless connections to eliminate poor contact; 4. Update or reinstall the keyboard driver to solve compatibility problems. Most cases can be solved by cleaning and setting adjustments. If it is invalid, it may be that the hardware is damaged and the keyboard needs to be replaced.

It is annoying to repeatedly type multiple letters when typing on the keyboard, especially when working or writing documents. In fact, this problem does not necessarily mean that the hardware is broken. It is often caused by minor failures or setup problems. You can check the following directions first.

1. Clean up keyboard dust and debris

One of the most common reasons is that there is dust, hair or biscuit residue in the gaps in the keyboard, which is stuck under the button and causes continuous triggering. Especially mechanical keyboards and thin-film keyboards that come with laptops are more likely to accumulate dust.

• You can first use a blowing balloon or compressed air spray can to clean the gap between the key caps
• Gently pat the back of the keyboard to see if any foreign objects fall out
• If it is a mechanical keyboard, you can also consider removing the key cap and wiping the bottom with a cotton swab.

Note: Don’t use a vacuum cleaner to directly suck the key caps, as it can easily suck small parts away; do not sway the keyboard backwards, as it may damage the structure.

2. Check whether the "Sticky Key" or "Filter Key" function is enabled

If some auxiliary functions on Windows are turned on by mistake, it may also make the keyboard look like "typing by yourself". For example, the "Filter Key" ignores repeated keys in a short period of time, but sometimes it causes delay or repetition.

• Open Control Panel → Easily Use → Change the way the keyboard works
• Check whether the options "Sticky Key" and "Filter Key" are enabled, and try to close it.

If you are not sure about the function of these functions, you can directly restore the default settings, which will generally not affect daily use.

3. Replace the USB port or try to connect wirelessly (if it is an external keyboard)

Sometimes poor contact with the data cable or unstable interface power supply can also lead to abnormal keyboard signal transmission and problems such as repeated input and missed input.

You can try:

• Plug into another USB port
• Try changing location using USB hub
• If it is a dual-mode keyboard, switch to wireless mode to see if there are any problems

If it is an old PS/2 keyboard, it may require restarting the computer to re-identify it. It is also best to power off when plugging and unplugging.

4. Update or reinstall the keyboard driver

After the system is updated, drivers may occasionally be incompatible, especially after changing the system version, various strange problems may occur in old devices.

The processing method is as follows:

• Open Device Manager
• Expand the Keyboard column
• Right-click your keyboard device and select "Update Driver" or "Uninstall Device"
• After restarting the computer, the system will automatically reinstall the driver

If there is no obvious change, you can also download the latest driver and install it manually on the official website.

Basically, these common causes and solutions are all there. In most cases, cleaning and setting checking can be done. If the hardware is aging or the key spring fails, you can only consider changing the keyboard.

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