Once, there is more than 100k to 300k data point, its unable to download as csv.
If we are using array object [{x:0, y:1, a:1,b:2,c:3}...], less than 80k point, its will shown out Failed- Network Error.

It looks like it is related with the length of data URL that is used to build CSV file. In case there is a huge amount of points, its length is too long. It looks like some browsers have limitations for data URL lengths.

https://jsfiddle.net/avkcxm80/