Hi,
I am facing very bad internet connection when the outside conditions go a bit humid, I cannot replace anything else than the house wiring. What cable would be recommended for this? CAT5 (fairly cheap) and use only one pair inside? I also have a thicker twisted pair, single core (not stranded), white/red - would this be suitable? I will use gel filled connectors for the outside connections (under the house).

Also, is it recommended to carry from one phone outlet to the next one or create a "star" configuration, with all wall points connected to the incoming telephone cable?

All this might not improve the quality as there can be something wrong with the 30-year old cable coming to the house, but there is nothing I can do about that...

Sometimes is working with speeds in excess of 1200kb/s and other times it times out (server not  found), pages loading in 15-30 sec, router cannot maintain connection with ISP, annoying stuff like that.

Thank you.