winning $1-$2 sng/mtt player, but losing 4nl player, why?
my roi in $1-$2 sng and mtts is pretty good at 18% with profit, but i'm a losing 4nl player. i'm also a winning $1/2-3 live cash game player. at 4nl, i usually buy in for 1.60 or so...not max because i'm not confident. i usually survive for an hour or so with the usual swings and play tight/slightly aggressive. i usually double within the hour and eventually lose it all. i've noticed that at 4nl, there are players who call with terrible hands and suckout when i have the best hand. i've stayed away from the cash game since i've come to the realization that i need to learn more.
what am i doing wrong?