perhaps your problem is TSR (Terminate and stay resident) programs. TSR is a software program that remains in memory until it is needed, and then performs some function. An example of a TSR is an antivirus scanner, which must remain loaded in memory to help protect your computer from computer viruses. malware and junkware can also use up memory. with something like a virus scanner, rebooting wont help because it will be reloaded. Microsoft edge can also be loaded and stay resident.
when running task manager widen the fields to see memory usage
