01 Suburban rear brake trouble

My right rear brake has worn out in four months. I did a brake job on it and had all rotors turned the right one was warped a little and when they turned it they told my it will not cut again. Now four months have past and the right rear is worn out again the rest are fine. Could the rear caliper be bad or a line colapsed enough to keep slight presure on the brake? Any ideas??? brakes seem to be a problem with these :disappoin

not aware of any specific issue with rear brakes. what condition were right and left pads when replaced 4 months ago? did both inside and outside wear the same? is the caliper sliding on it's mount freely? how does the right caliper compare to the left when moving the piston back into the caliper with the bleeder screw open? do either appear to be hung up? if not hung up, check out the brake lines back to the ABS control unit. Any ABS codes? can;t think of anything else now, will look forward to your replies to questions above.