FL or rebooted entirely. Sometimes it will play the same song to say 10 seconds, sometimes to 3 mins, it's totally random.
UPDATE:
I have just opened FL20 fresh and not loaded a project, but thrown a few stock ...
moves and plays for 10 milliseconds from the designated start place, but after those 10 milliseconds it stops and will go no further, i tried updating to 12.4.2 but no luck, i've restarted FL and my computer with no luck. ...
FLStudio lags like hell. When I don't play audio, everything seems to be fine, I can tweak knobs, plugins, open and close the mixer, but once I hit the play on the playback, I cannot do anything anymore ...