A couple of days now my internet is very slow, I have tried another browser, resetting my router etc.
I use ethernet, not Wifi.
As you can see, my ping and Upload speed are normal but my download speed (usually it was 54 mbps in the speedtest) isn't: http://gyazo.com/af4e256949fb72e0a6c2637b62a2c5de
I use a Devolo 500 mbps for ethernet, I have tried switching it with an older ethernet box and it seems that gives me better download speed.
How can I fix this problem so I can use my new ethernet box (Devolo 500 mbps) again with a good download speed?
Your Devolo 500 used to give the proper speeds and now you got issues and is your download speed crap from every source?
You have a TP socket in your wall solution, guess you dont but anywa if so try without router.
Check your ISP's webpage on the stoppage(not sure that is the proper english word) page and see if they reported any issues or work in progress in your area
Check Devolos website for a possible firmware upgrade