@Dajo Please don’t throw it out of the window, that’s exactly the kind of thing we work to prevent 
Jokes aside, I’m sorry to hear that using the Fairphone 4 has been frustrating for you. Ghost inputs can really get in the way of everyday tasks.
Contact our Support team and they’ll be happy to arrange a repair for you.
Regarding the dimming screen, our Software team is currently investigating a couple of different root causes.
- Temperature - I can confirm that the screen is dimmed when one of the temperature sensors reports a high temperature. We are looking into adjusting the temperature threshold so it stops triggering under normal operating conditions.
- Proximity - We’ve received reports that sometimes direct sunlight causes the proximity sensor to report a near object, even when it’s completely unobstructed. This can be especially annoying when using apps that turn off the screen when you hold the phone by your ear (for example during phone calls).
There seems to be some overlap so we’re not sure what proportion of reports come from each issue, or both. Unfortunately, that’s all I can share right now. When I know more about when a fix is coming, I’ll post an update here.