LS-6b Spoiler Issues

A friend of mine has a LS-6b and on several recent occasions the spoilers have opened when he changes the flap settings during normal flight. The linkage for the spoilers goes through the push tube that operates the flaps and sometimes that has deployed the spoilers during normal cruising flight. Has anyone else had that problem and what has been the solution to the problem. During the last several annuals we have tried to clean the tube and pushrods, but it has not helped much.