This past weekend I completed a two day hand gun training class and did not have one issue with my SD, shot nearly 500 for the two day.
I just cleaned the old lube off and reluded the pistol the night before class. I use wheel bearing grease on the rails with a little gun oil added.
I just lubed my pistol up like I normaly due just to start with a freshly lubed gun for the class and did not clean or add any lube once I started the class.
The only problem that I had was the rear sight came loose by the end of the class. This did not stop the pistol from hitting the target though. It seems the set screw backed out a bit so the rear sight can know move from side to side in the dove tail.
I just need to reset the rear sight and loctite the set screw this time.