Sure. There are several posts in this area already compaining of the problem.

1) OS = 9.2, LW memory = default setting
2) Switch from LW to the the Finder. LW will quit.
3) Switch from LW to another app & then return to LW. LW will quit, or the finder will lose some of it's functiopnality (like submenus).

Recent experiemnets show that increasing LW memory allocation to 100mB and higher seems to help. I am rumming now with 200mB and it seems to actually be working.