So for quite a while now, I have been having issues with my pc.
After using it for a couple of hours (playing games, browsing the internet, using it for university work, etc.) its performance is noticably lower than just after startup. Task Manager tells me that

svchost.exe Service Host: DCOM Server Process Launcher

is using about 25% of my CPU and 30% of my RAM. This seems incredibly high to me. Restarts solve the issue but I would rather not have to of course.
I've googled the problem already, but a lot of forum posts are from people using Windows 7 or are unsolved.
Standard Microsoft procedure has you using RAM checkers and all that. I did that, and the results were that my RAM is fine.
It is also not Windows update sharing as some suggest as I have that turned off.
I'm really hoping someone can help me here.