I notice since a couple of days/weeks that my personal heatmap does no longer display my path in given areas, depending on the zoom level. When you move around or zoom in and out, at times it displays the heatmap, or it doesn't, as if the rendering would fail due to some specific locations within rendering area.
I made a screen recording. (Android App)

I couldn't find anyone reporting this yet. It would be very helpful to get it to work reliably again.

As an international traveller, I see the personal heatmap as one of Strava’s most useful features.

Thanks!