Beware the Sulfites. Sensitivity to sulfites is common among asthmatics. For me, an allergic reaction can result in a severe asthma attack. Dried fruits are usually responsible for the reactions. As with all processed or manufactured food items, I consistently check labels.
In some rare cases, dropped frames can be caused by an old network adapter driver doing a poor job of handing the high speeds being consumed. It's not a bad idea to just check to see if there are any new drivers for your network adapter, just to be sure.
I think you guys named just about every moving part connected to the rear...That really narroweded it down for him...lol. Normally look to the carrier or pinion bearing. Biggest cause of a failed pinion bearing is the NUT backs off the yoke. which in turn makes the pinion loose changing the preload which prematurely wears the pinion bearings. LOW fluid level will be the next biggest culprit of bearing failure. Good luck on the search for your HOWL. Jim :thumbup: