@Kevin_Z After 3 days I could confirm. There is a BUG. The connection was fine until yesterday, then it dropped again to 100Mb today. I checked the Negotiation Speed Setting and it was fine -> 1000...

@Kevin_Z Looks there is a BUG, because, after doing all the changes, the speed was ok, but suddely the limit was estabished again around 100Mb. Without any change in the configuration, I turned off...