I applied a year and half ago and have received two letters asking for info. The first asked me for a police report from the year I lived abroad. Seemed normal.
The second letter asked me for info on why it took me a month to get an appointment for a visa renewal. This one seemed a bit weird... my passport gives me three months to stay in Ireland before I apply for a visa. I made my appointment a month before I arrived and there just weren't any appointments for two months. I was covered by my tourist visa for the first month then had my appointment

Anyway, is this usual? Nothing has changed with my application, of course, but I'm dealing with another round of questions (that, honestly, I find self-evident).