I'm using Asus Transformer Book Flip model TP500LN-CJ088H. Some of the keypads such as a, d, f, j, k, l, ;, ', 6 stop working several months ago. Since under warranty, I've sent it to asus service centre to get repair. Upon picked up, the keypads working as well after been formatted and I've been told by asus's staff it was just a software issue and no keyboard/hardware replacement done. Now the keypads problem happened again as before. I've tried in so many ways to fix it such as removing the battery for seconds (as recommended in so many forums), turn on/off filter keys, trying it in safe mode, turn on/off num locks, delete the driver in device manager and restart, updated the latest drivers from asus website, OS reset/formatted and others but nothing works so far. Please help me to fix this out.