I've had that problem for a while too (unclipping on the strong foot), and a few realengers I've spoken to have confirmed that this is a common occurence with worn-down spds. According to them the only solution to NEVER unclip is... Time atac.
In the meantime try switching the cleats form one shoe to the other - they get worn in a certain way and will feel tighter if swapped around.
I've had that problem for a while too (unclipping on the strong foot), and a few realengers I've spoken to have confirmed that this is a common occurence with worn-down spds. According to them the only solution to NEVER unclip is... Time atac.
In the meantime try switching the cleats form one shoe to the other - they get worn in a certain way and will feel tighter if swapped around.