I bought a used Philips 50PUK6400 Android TV. This device randomly restarts. Sometimes it works for hours sometimes it reboots every 5 minutes.

Anyone knows about this issue and how to solve it?

I found a website from philips stating it happens due to unstable internet connection mostly with straming apps but lately it happens even whilst I'm just in the main menu. Any help, shared experience or comment (besides 'have you tried a factory reset') is very much appreciated.

What I would also like to find out is how to enter recovery mode.