Join Date: Aug 2017
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Assuming all parts are correctly assembled (e.g., no bad prior body repairs involving doors/hinges) and there are no alignment issues (e.g., the door doesn't sag and it does line-up properly during/after closure), my first suggestion would be to lubricate the hinges. I hesitate to use something very skinny like WD40 (tends to evaporate fairly quickly where I am), but it is a good enough place to start.
Locate the hinge pivot points and spray/apply lubricant to the points of access for the pivots. Gently move the door back and forth to work the lubricant into the joint to see if there is any improvement. )You may have to repeat the process more than a few times to help get the lubricant into the hinge joint.) If so, a lack of lubrication could be, at least in part, some of your issue. Lubricants to use vary by personal preference. Some people like lithium grease in an aerosol can, some like WD40; personally, I like several drops of engine oil applied to the hinge.
For what it is worth, I hope it helps.