Hi there and welcome
It is overheating , and will likely be from Dust as this is the number one cause for this.
Remove the power to the computer, open it up and clean it completly. Remove all dust and make sure it is very clean.
Close it all back up, connect the power and check if you still have the problem.
Let me know the results please
That is correct, though a cloth is usually enough, if you need to blow it out use compressed air as opposed to vacuuming.