If you are on FTTN that is the kind of problem I had, to do with flaky copper joints. For me, converting to FTTP was the answer. Fibre is not affected by water -- or lightning for that matter (though mains equipment such as routers and NTD box are vulnerable to very close strikes). An FTTN connection makes use of nodes, which are active cabinets with mains supplies inside. In contrast FTTP uses fibre distribution hubs, which are part of the 'passive optical network' (PON) ie no mains or other electric power is involved.
