.05 second dropout? I don't know if my ears can even detect that short duration!! So tell us this theory of yours.
As for stevez comment, often there are two advertisements being broadcast simultaneously... one from the original network feed and the other from a local insertion point. There are encoded signals that will mute the network feed so as to allow local advertising/announcements to prevail. When these radio spots are not exactly 30 secs or 1 min. etc. and the local spot ends a second too soon, you hear the tail end of the network feed pop in. The transition to digital control and digital audio to the ad insertion equipment has greatly reduced the error factor behind all this. However it still occurs on occasion. Prior to the newer technology, timing of begin and end times was critical.