Potosí - & running out of wi-fi?

We have just arrived at Potosí (altitude 4090 m). I think this is the highest place we stay overnight on this trip. Wi-fi here is not brilliant. (It's actually a surprise it's been as good as it has here in Bolivia; in fact I would say it's better than in Peru). I imagine it'll disappear after this as go into the Bolivian salt plains. Won't be back in range I imagine until 12 May.