This is not a new problem for me, but I encountered it again this morning and thought it was time to report it. Many of my (older) notes have lost formatting, especially lines between paragraphs (the whole appear as a block of text) but also hyperlinks.
Moreover, not infrequently, I encounter font problems: pasting from a resource introduces a new font or font size instead of smart pasting. Sometimes, starting a new paragraph will reset the font (say I had it at size 11 and the default is 12, it will revert to 12 when starting a new paragraph or erasing a new paragraph using backspace and starting another one).