My theater had an Expression 3 that had a few things not working, like submaster 1 and 3 of the 5 E wheels. Our sister campus had an extra Expression 3 laying around (because they just got an ION, I'm very jealous) so we swapped the two boards out. However, now almost every time I turn the board off at the end of the day, I go back out into the theater to find one or two lights on. This has happened to me before in other venues and I know that after a few minutes it will realize it's not actually getting a signal and turn off but with this board it happens nearly every time. Does anyone know what causes this and if there is any way to fix it?