I have also had problems over time with assorted rolling stock that insisted on uncoupling when not wanted, but obstinately refusing over an uncoupler !!
Solutions seem to have been suggested already. I just wanted to say that at an exhibition I went to in Hungary there were full, and I mean full, length trains running without any untoward incident whatever. The answer appeared to be meticulous care in laying the track in the first place. The owner of the layout is a superb modeller and pays attention to the tiniest of detail.
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