I was in between flights, working on “Jack of all planes” achievement. Since I was frustrated for being stuck on 90%, I was trying some Deluxe and Premium planes, like the C172 steam gauges and DA40 steam gauges. The message “your data is out of date” showed some three times, in different moments. The first I don’t remember, but the following ones were when I noticed the sim was off-line. Once enabling server connection, the message showed up.
I was using pms50-gns530 GPS mod and have several others installed, like Working Title, Fly by Wire and others.