Hmmm, sorry to hear my circuit is giving you trouble. You're saying the relay is getting power even when you disconnect the Vacc line and short the cap? Could only mean your MOSFET is stuck open (i.e. toast), try another one. Is the circuit mounted in a hot place or something? My original circuit has been working fine for over a year. Oh yeah, I did notice the 50 Ohm resistor overheating, so I bumped that up to .5 KOhm. Might as well replace it.