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 have a auto repair shop that I support on the side, and I set up a decent little 6-camera system with Acti IP cameras and milestone on a low-end dell poweredge server. Very similar to my work setup. This guy is obsessive, and spent days watching every frame in the playback window. He's challenged me pretty seriously about dropped frames - you see a guy walking across the parking lot, and then a few frames are skipped, then he's 5 or 10 feet further down the way. It occurs to me that I've seen this before on other systems I've set up. I always just accepted it as a fact of life: Sometimes cameras drop frames. But why?