So I've got some Cacti but they seem to be slightly incompatible with my Vivitar DF-383 flash. The flash has a sleep function and if it isn't used within 3 minutes it goes into power saving mode and shuts off. Problem is the flash doesn't know that it's being used while using the Cacti and it shuts off anyway, right in the middle of a shoot. Anyone know a way around this? Or know a flash that doesn't have an auto-off that I can buy and not worry about ripping the velcro off my softbox or lowering my light stand to get at the flash every 3 minutes?