Image captures above 1600x1200 not working

Running the example from this library with an SD card installed. Works as expected for resolutions up to 1600x1200:

```
Snap!
Reconfiguring resolution
Snapped 1st 14106 bytes (1600 x 1200) in 235641 ms

Snapped 2nd 244152 bytes (1600 x 1200) in 468 ms

Saved JPEG to filename IMAGE012.jpg
```

However, at the next highest setting, and all settings higher, the capture fails:
```
Snap!
Reconfiguring resolution
Snapped 1st 13986 bytes (2048 x 1536) in 21447 ms

Couldnt capture second frame

```

Reproduce the library example with an SD card, comparing 1600x1200 with 2048x1536 and higher resolutions while checking the reported serial output. Trace the image-capture path used by the example to determine why the second frame fails; done means higher-resolution captures complete and the JPEG is saved successfully.

Written by the indexing model from the issue text.