1971 slab built 2-story suddenly going tilt Over the past six months I'm seeing doors going out of alignment in the same direction, now to the point where many of the latches no longer catch. House is built about 150 feet from a creek on alluvial soil.

Seeing as how we're not in limestone/sinkhole country, what could explain this sudden settling, and what are my options to get the house put to rights? House is a wood frame bolted to a solid slab.