Ubuntu 16.04 LTS keeps freezing every 20-30 minutes

Hi there. I'm not completely new to Linux, I had Ubuntu installed back when Gutsy Gibbon was released and also had Debian installed. Decided to install Ubuntu again because Win10 kept aoying me.

Anyway, it's not working well. Ubuntu keeps freezing on me like every 20-30 minutes. There's no patte here as far as I can see. Once it crashed when typing in an URL, once when making a call in Skype, once when configuring the Unity Launcher and so on. I have not mounted any drives, I've unplugged my HDMI cable from my TV, but nothing helped. I guess it might be a driver issue, but where do I even begin to look? I'm pretty sure my hardware is fine, since I haven't had issues like that in Win10. I also tried an older keel, that I could chose under the advanced boot options, but this didn't help either.

I have an intel CPU and GPU. It's an Acer ES1-711 notebook.

I know this is not a lot to work with, but I hope someone can help me out.