Your Garmin help, please

I have used a gpx track to do a 270 mile course, not all at once i may add. Tcx files I have found tend to get a bit iffy on longer rides and occasionally they have been truncated hence my belief they have reached a point limit.
Here is info from the garmin site ref the etrex series, unfortunately I cannot find the same data for the edge series.

eTrex 20/30 limitations

2,000 GPX files
2,000 waypoints
5,000 geocaches
200 routes, 250 points per route
200 saved tracks
2,000 archive tracks
10,000 points per track
100 custom map tiles
250 BirdsEye Imagery files
Approximately 3,000 mapping segments