Originally Posted by RPK79

Do not shift the front when cross chaining. Better yet, don't cross chain(especially with a triple crank).

Originally Posted by smarkinson

After rereading your post it sounds like cross chaining. Don't use big rear sprockets with the big chain ring. You are forcing the chain to bend laterally whenever you cross chain and big sprocket to big chain ring forces the chain to bend the most as the distance between the two points at which the chain bends is the shortest.

EDIT: a new chain will also bend side to side less than an older worn one.

Originally Posted by valygrl

I wonder if the chain is too short? Total guess...

Originally Posted by halfspeed

If that doesn't fix it, use a better degreaser. If that doesn't fix it, try the mechanics forum.

Originally Posted by trailflow1

Might be chain suck.

Some good info here
J LEVY | BikeTechArticles | Chain-Suck : Its causes and mechanisms, How to avoid, prevent, and remedy
Diary of a Mountain Biker

Also check there are no stiff links in your chain.

Chain lube will not make a differrence.