***[link|https://www.ifixit.com/User/3485601/Sandro+%C3%86nima|Sandro Ænima|new_window=true] ***make sure that all of your drivers and your BIOS are up to date. Then make sure that you turn any power saver options on your OS off. If all of that is okay then you may need to consider replacing the keyboard. It could be the keyboard controller so try a USB keyboard and see if that stays fully functional. Use these guides to work on your computer [[Topic:Lenovo IdeaPad 330S]] or download the maintenance manual for it [https://download.lenovo.com/consumer/mobiles_pub/330s-14ikb_330s-14ikbx_330s-15ikb_330s-15ikbx_hmm_201903.pdf|from here] You'd be looking at the upper case.