ello there m8.. well if you have 2 fans and your hps with a timer all in the same power lead.. then you probly need a light switch timer contactor.. coz them home timers you use are not really for use with big hps lights more like a livin room light.. that may be why its cuting out.. i have the same as you 2fans and my hps with a timer plugged in the same power extention cord .. but mines ok.. so may a timer contactor is what you need.. on www.growell.co.uk they sell them.. under grow light spares and accessories.. they are a little expensive.. but if thats what you need im sure it will be worth it.. any1 else wish to comment on weather a timer contactor is what he needs?? anyways bro hope you sort your tweaks out