Internet Speed

1. Reboot your router.
2. If still the same, how's old is your modem/router from Telmex? Those things are crap and don't last. If more than 4-5 years old they should give you a new one for free.
3. If still the same, they may have a problem with the hub that branches to your building. Report it and cross your fingers.

Even the lowest speed service from Telmex should be plenty for streaming.

Recommended: get your own mesh wifi router and only use the Telmex one as a modem. Everything will work even better that way.

Also make sure the bill had been paid. Talked to someone recently who was having intermittent problems, and the cause was their auto pay credit card was cancelled. No communication from Telmex about it, and they did not get cut off, but they did get random extreme speed throttles.