There is nothing like answering your own question.

After more testing I have found that increasing the PHP memory_limit fixed the issue. Which would all make sens the larger resolution of the image means more processing to compile the different sizes when uploading and saving the image.

I increased it to 96M and problem gone.

There is nothing like answering your own question.

After more testing I have found that increasing the PHP memory_limit fixed the issue. Which would all make sense, the larger resolution of the image means more processing to compile the different sizes when uploading and saving the image.

I increased it to 96M and problem gone.