Hello. I have problem with my ethernet. So yesterday I got fiber optic 600mbps. After everything I go into speedtest sites and I want to check how fast is my download speed on my computer. Unfortunately my download speed was around 60 mbps. I checked my phone and same problem on wifi, So I turn off and on switch and somehow I got around 500 - 600 mbps download speed on pc and around 300mbps on phone. Today my pc again has got only around 70 mbps download speed but my phone is about 300mbps so I am sure that everything is fine with fiber optic. Any idea what can cause problem with my ethernet? Cable should be fine becouse It works so good yesterday. Ping is very good and stable (around 8 ms in my country).