I have a delta build I've been working on for the last 6 months (including design, I'm not that slow).
It uses a 24v 600w 25A power supply, with a 380mm heated bed. When printing the printer will sometimes just stop for no apparent reason, the motors disable and the hotend drops. This often happens after the hotend/ bed have finished heating and the head starts to descend to start printing. No error on the LCD, just continues saying 'printing…' but the printer becomes unresponsive over the web interface.
Other times it works just fine.