Very strange then. Im only switching 240V max. The smoke machine has the highest rating at 750W but most of that is for the big heating coil and so the relay shouldnt have much to deal with at all. Using a triac for the smoke machine is definately helping. Its hardly reseting itself at all now. The solenoid seems to be working fine and in about 500 operations has only caused a reset once. Im going to replace the 10K resistors with a plain wire and see how things go then. A teacher at my old school said 10K might be too much and MCLR isnt getting enough power.

The real test will come in a few hours when i try running 3 smoke machines, 1 strobe, 1 solenoid and about 20 LEDs from it at the same time.

BTW, when you say "purely on/off", what else could it do?