2007 SV6 shutting down while running

[zabrinadoyle@yahoo.ca]

Hello everyone. I'm having some problems with my SV6 now that I'd love some opinions on!! Started 2 months or more ago, one day the van won't start, its like the battery is dead/dying - when this happens my lights flash, horn honks, locks lock and unlock. take her in and get the terminals cleaned up/tightened, mechanic says the battery is fine. I'll get a boost and things will be fine for days than one day it'll happen again. no radio/lights etc left on, no cause for dead battery. happened 3 times one day so I borrow an eliminator from my boss and keep it in the van in case I need it. go a whole month! without it happening, than it happens twice in one day again... and not since... I drive a lot every day, multiple times starting her up and going. this was problem enough, I was thinking I'd replace the battery, terminals alternator etc etc, haven't had the chance to do it yet, but today I was driving her, saw a light flash on the dash but idk what one it was because I didn't actually see it, than a second later while I was pulling into my dads driveway the van shut down for a split second, radio shut off, lights flashed, locks unlock and lock, it was the same as when my battery would die, except it happened while I was driving. from there I had to take her 3 kms to get back home and it happened 3 times while going straight down the road. for that second the van goes crazy while still in motion, I can feel her slowing down of course, but than it kicks back in and keeps going! what the hell is going on? I'm afraid to take her anywhere else.
thanks

 

[melsg5]

did you have it scanned for any codes?
it could be an ignition switch starting to fail

 

[zabrinadoyle@yahoo.ca]

at the moment the the check engine light isn't on, I thought it had to be on to check a code? when I was reading through last night it says the engine light could be emission related or ignition related so I wondered that too, would she behave like that if something was loose ignition wise? like a messed up wire or something ? could that be why sometimes when I go to start it almost shorts out and boom the battery is dead?

 

[melsg5]

so it will start if you get a jump?
if so, did the mechanic load test the battery?