I have had issues for the past 5 months with an IPTV service I use. It won't work now with Cable Del Norte since they changed something with their supplier in the US which is COMCAST. Others have also complained to them about similar problems without resolution. (I tested it with CLARO internet and it works fine). Cable Del Norte is also blocking access to a banking site in the US. I hate to say it, but I await CLARO fiber optic service in my area. They insist they did nothing to block anything.
It could be something your ISP has done that is blocking access.