I have an 08 Altima. After brakes started sticking and rubbing I replaced pads and in appx a week they were rubbing again, as well as sticking on passenger side. This time I replaced the pads again,as well as replaced the rotor on passenger side. After a couple weeks, same problem. This time I replaced pads(rotor was ok) and calipers on both sides. This was ok for month, maybe... And again same problem!! Please help, any ideas on the subject.. I have never had this problem before, so I am a bit perplexed!!
In addition to the slider mechanism sticking as described in jwh20's answer (This would be noticeable as more wear an one of the brake pads than the other).
I would also check the condition of the flexible brake hoses. It is possible that there is some kind of kink in the flexible hose that allows brake fluid to be pushed toward the caliper when the brakes are pressed, but resists the fluid's escape when the brakes are released.
Additional useful information by @MTA from the comments -
"The kink can be internal, inside the flexible hose and not visible from the outside. With the car on jack stands, if you step on the brake and release it and then find that you can't rotate the wheel that has unusual wear, loosen the bleeder. If brake fluid spurts out under pressure and the wheel becomes easy to rotate, it's a bad brake hose."
Sounds like your slide pins in the caliper bracket are not working as expected. You mention that you replaced the pads and calipers (which is an odd thing to do) and did it twice. So you've already spent a lot of money on this thing.
It's always important to service the slide pins when replacing pads and rotors. If the pins don't slide the calipers will be fixed in place and you will get excessive and uneven wear.