2000 chevy suburban, good battery, no power to anything

So a couple weeks ago I started having an issue where I
would drive the car around with no problems but after
parking and running errands I would come out to the car
and when turning the ignition I would get no response (no
dash lights or radio). After popping the hood and messing
with the negative cable I would get back in the car and it
would start up instantly like there was never a problem (the
radio time was reset of course). This happened today and I
got it to start twice but when I moved it into gear the power
cut out entirely ( no lights on dash or radio again).

Not sure if an ls1500 or Lt1500. The car does have 4wd
though