If your GK64 Hot Swappable Mechanical Keyboard has sticking keys or not is transmitting to your computer, use this guide to replace the faulty switches.
Faulty switches do not transmit a letter you type onto to the computer, this is do to sticky keys or switch failure. When replacing switches the keycaps must be cleaned as well, as buildup can make even new switches still stick.
No special skills are required to complete this repair.
When buying replacement, switches ensure they have the same switch weights. The spring inside the switch determines this value. If you are unsure of the weight, you can find this information in the technical specs section of the keyboard manual.