Thanks a million @Michaelhello
I did not know this website from Netflix, but it is very useful tool.
In the graph I attach here, I can see than in October 2015 the amount Mbs started dropping, just in the moment I started facing issues., very big coincidence .-) Previous to that, it worked very well.
Righ now UPC is the lowest one and it has dropped quite a bit since october (4.12Mbs) to (3.36Mbs).
Obviously something is going on….