Ha! That's it! Last year I rebuilt a wheel set with better quality Sapim 14ga spokes. I have been totally satisfied with the rebuild and then noted loose spokes a few months ago. I have been totally perplexed. Across all the spokes, all were moderately loose on the rear wheel. When I top off the air in my tiers I routinely ping the spokes for changes. With all the spokes getting evenly loose the pings did not really change. I should have Formed the spokes at my rebuild and from now on I'll use the Squeeze Technique to check their tension at each airing... Thanks...