From my experience with stuck rods, it seems to happen when you place your rod down. Every time you put your rod down letting the butt hit the floor freely it pushes the top section in further. When you put your rod in a holder or stand your rod on the floor place it do not let it fall freely. Also applying ferrule wax or chapstick helps greatly before putting your rod together. I hate when I see guys put their rod top in the bottom then give the butt a few taps on the floor. That is not a good practice if you don’t want a one piece rod or a cracked ferrule.