You have a laptop and your type of issue mostly occurs on laptops.
On this forum, I have found two sources for this type of issue:
2. Circuit problem
Then again, rarely a keylogger virus. However, ensure it is not a virus before we look at the other possibilities.
Download, install and run Malwarebyte which you can find on this site:
Ensure you make an update.
Please request a FULL system scan, which may take from 20 minutes to hours. Do not interfere no matter how long in takes. The creators of Malwarebyte recommend that while the tool is running that you go do something else, such as watching a rerun of Gone with the Wind or read Tolstoy's War and Peace.
If Malwarebyte restarts your system, launch it again to finish the Full scan.
When the scan is completed, delete all items found.