Pushing specific Key produces multiple Keystrokes

The 1, Q, and Tab keys intermittently produce nothing or several presses, while Shift combinations fail too. That can come from repeated-key filtering, a driver, or the laptop keyboard matrix, so start with comparison testing. When the fault appears, try the Windows On-Screen Keyboard and an external USB keyboard. If both work, the built-in keyboard, ribbon cable, or contamination is the likely boundary. Also test the keys in UEFI/BIOS; repetition there confirms Windows is not the cause. In Windows, turn off Sticky Keys and Filter Keys temporarily, remove the keyboard device in Device Manager, restart, and install current ASUS BIOS, chipset, and keyboard updates for the exact K571GT/X571GT model. Avoid registry repeat-rate hacks before this isolation. If only the built-in keyboard still misbehaves, back up the device and arrange hardware inspection, especially after liquid exposure or chassis flex.