Try opening the task manager and under the process tab see what apps are using the memory. Shut down any that you are safe to end and do not need to be running like a streaming service, another browser, editor program like Office and notepad. There are a lot of them that start automatically and run in the background. Another possibility, although not likely as it’s a year old is you may have a memory module that has gone bad. Go to the control panel and look under system to see what the installed memory shows.