Frequent Physics Issues
From Physics Simulation Wiki
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Avoid Scaling
Don't scale your objects. Apply scale using CTRL-A. If you use Sphere-bounds, make sure the radius fits the sphere:
Keep masses for dynamic objects similar
If an object of 100 kg rests on an object of 0.1 kg, the simulation will have difficulties. In order to avoid large mass ratios, keep mass of objects similar (in the order of a few kg)
Assign the right bounds type
For a cylinder, choose cylinder, even for non-moving objects. Similar for a box etc. Convex Hull can appoximate meshes for moving objects and static objects.
Don't use too many vertices in Convex Hull meshes
About 4 to 32 vertices should be fine.
Leave the gravity to 10, don't make it too large
The physics simulation works better with smaller gravity, so if possible don't use large gravity.
Avoid very small dynamic objects (< 0.2 units)
Don't make dynamic objects smaller then 0.2 units if possible. For the default gravity, 1 unit equals 1 meter, so any 'side' of the objects should be bigger then that.
No large objects
Don't use large objects, or large triangles.
Don't use degenerate triangles
Triangles that are have extreme long sides as well as extreme short sides can lead to problems.
