Why is my milk frother not getting milk hot enough

My milk frother no longer gets milk hot enough for a latte and the milk does not foam properly. I have cleaned everything that I can think of cleaning — including descaling and using the cleaner fluid for the frother. The frother works better (but not normally) when I use the cappuccino setting and the hot water function seems to work fine. When the frother is working to make a latte, a large puff of steam comes out at the beginning but then as it pumps, it appears to be pumping water (and not very hot) as well as milk. Is there a quick fix I am missing or do I need to take it to the dealer?