Technically all you (and me actually) are paying for is the internet access. The rest are provided free of charge with the internet access.
Plusnet have for a number of years, told their customers about most of the little problems. Sometimes this means that their service actually looks at first glance to be worse than it actually is.
The current problems are all caused by the storage cluster hitting load problems. A fix is being introduced and is scheduled to be installed sometime next week. In the meantime they have introduced a number of temporary measures to try and alleviate the problems.