Some months ago the hot water sink tap in my bathroom developed a problem where the water flowed a lot slower out of the tap as it got hotter (water flow was initially fine when cold). This increased in severity over a few weeks until it would come out at no more than a dribble when the water was hot or cold.
The plumber replaced the brass cartridge assembly inside the tap (the tap must be about 20 years old at a guess) and all was well. This was about two months ago
However, over the past two weeks the problem has started to return. Cold water flow isn't bad, but once it gets hot it comes out at a dribble. Surely the new cartridge can't already be developing a problem?
The water flow was fine for a good two months after the plumber (a good, reputable guy) replaced the cartridge.
Could another part of the tap also be faulty? Or might the replacement cartridge be at fault?
Just to give you an idea, this is the general type of cartridge in use (but not the exact same model):