@leocg Thanks, I was thinking about reporting this to them but first I had to talk here to see if anyone else had this happen.

@leocg Yes, before and after. I don't use VPNs I have no need for them (so far).

@leocg The email I get is the exact same and it says the following:
Critical security alert (in the subject of the email)
Suspicious activiti in your account.
Someone might have accessed your Google Account using harmful malware on one of your devices. You’ve been signed out on that device for your protection.

After which I get logged out of all my devices.
It hasn't happened yet since yesterday when I posted the thread but it happened everyday since last tuesday.

Everyday I get emails from google saying that it has detected a suspicious app on my windows device and it logs me out, it's really annoying and it started doing so for a full week now. Any ideas? Does it happen to anyone else? I've uninstalled the browser and reinstalled it with clean registry and everything, still happening. This never happened with normal Opera.