Besides something like a pinched nerve (maybe not even in the lower back) that could be causing you to seize up one thing that comes to my mind is tight hamstrings. If you stretch them regularly after you do legs then never mind but if you don't they may have gradually grown tighter. Tight hamstrings pull on the lower back causing it to hunch and you may not even notice it. That is something to evaluate. Also tight hip flexors (psoas) can do that. In general lack of flexibility or imbalanced flexitbility can cause problems like this. Just a guess though.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.