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Once you set the snap criteria, they stick. I recommend selecting only the settings you use - end point, intersection at a minimum, and then add the others you need.
Make sure you have Virtual and Offset turned off, as these are the easiest to misinterpret. Perpendicular is sometimes problematic, though once you get used to it, it can be very helpful.
Can you give a little more detail of what you are seeing?
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