Mates solve in large assembly mode, not in small asm mode?

The assembly im working on only has about 60 parts, the mainpart everything is attached to is a tube that is about 150 feetlong (I dont know if the actuall size of the assembly warrantslarge assembly mode or not) and maybe 1.5 feet dia. My problem isthat in small assembly mode every mate wil be fine, and then i do arebuild and pretty much every mate will have an over constrained orsome other warning on it and other parts will not move when i dragthem. I turn on large assembly mode and all the warnings go awayand the moving parts function as they should. Whats going onhere?SolidworksAssemblies