If there is a problem with your laptop keyboard, then you might have to replace it. In some cases, it might just be because of stuck keys. In which case, you can carefully try to resolve the problem by removing the disturbance that is causing the key to stick. In some cases, it may be because of poor contact on the motherboard due to particle deposits on the contacts. In such cases, you would need to remove the keyboard completely and clean the contacts of the keyboard that attaches to the motherboard. You can use some alcohol based solution to clean the contacts. Or an eraser to rub of dirt from the contacts.