Doors constantly jamming

We bought a 25-30Yo Brick Veneer house a couple of years ago, one thing i noticed was that many doors would swing open or shut, meaning they were not upright, I can see that pretty much every door is off plumb visually in the same direction, towards the front left of the house, by this I mean I can see the gaps around the jambs all taper in the same direction. Initially I had to realign about 4 doors so they would actually shut. what I am worried about is that this is a continuous progress,about 6 months ago I had to plane a bit off one door, and now it's sticking so bad I have to do it again. Is this caused by the slow erosion of the support under the stumps, which are concrete, as we do have some water getting under the house, should I get the house restumped?


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