Gaps in Heatmap

[fulmar2]

I'm curious to know if this is a known issue, or if there is a resolution to an issue I have observed.  In the heat map, I often see large "gaps" in sections that have been ridden.  It would be useful if the sections were contiguous.  In fact, for some longer tours (such as a cross country tour), the heat map line almost entirely disappears when I zoom out.  I have uploaded two examples of this occurring:

See the Orange lines do not connect? As you zoom out, they even disappear entirely from the map.This is what I mean by "gaps" in the heat map aka segmented heatmap.

[fulmar2]

Jane - Thanks for the reply.  In the first screen shot, yes, it is zoomed in as much as possible. In many instances, the gaps do not disappear (though on some tracks, they DO disappear).  I cannot discern any difference between tracks where the gaps disappear / don't disappear; I've considered age of track, point density (i.e. older tracks w/fewer timestamps, etc)...