I've had that problem alright!
My current one is the Airfix Scammel Tank Transporter. Everytime I think I am ready to continue to paint and finish it, some other part of the wheels or suspension falls off.
I've been working on and off on this kit for more than a year now, and I usually don't do that. This kit is a serious challenge to my limited patience. It is back on the shelf again for the fifth time.
Robert, what do you mean "during my modelling years."? [:0] That implies they are over! Aren't they still happening? I didn't think they ever ended!