Telmex is so undependable, I can't remember how many times a RV or some truck has hit their low lines and the modems go down.
Telmex local wireless infrastructure is so old that they have outages a lot. To get Movie Star I have to drive down the road to get service.
The problem might be solved. A couple of RV friends have told me about an independent company that sells you a modem for $2500.00 pesos and $500.00pesos a month for service. They said it was 5G. It must be satellite service? I'm waiting for more info.