2003 dodge durango 4.7 rear brakes sticking?

rear brakes start to stick after approx 20-30 min of driving. had hose replaced as well as both rear calipers. problem continued just had rear rotors and pads replaced and bled the line. driving down a steep hill today and let off gas truck started to slow and noticed a burning smell. if i let the truck sit for 10 min the problem goes away then comes right back. any ideas ?
 
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