SRAM AXS is usually pretty damn reliable, but occasionally things can go wrong. Check out this guide for some tips and tricks to get back to shifting nirvana.
Cartridge style dropper posts are both cheap and reliable, but a little preventative maintenance certainly helps. Learn how to keep your dropper post in tip-top shape with this guide.
Over tightening a seat post clamp can compress dropper post internals, causing permanent damage. Here are other ways to clamp the post in place without turning the screws too far.