Image upload error with code 500 and 503

Question

E/Volley: [615] BasicNetwork.performRequest: Unexpected response code 500 for https://imgur-apiv3.p.mashape.com/3/image
E/ImgurUploadTask: Failed to upload image file. json =
com.android.volley.ServerError
at com.android.volley.toolbox.BasicNetwork.performRequest(BasicNetwork.java:163)
at com.android.volley.NetworkDispatcher.run(NetworkDispatcher.java:112)

The error rate raised up to 10% to 20% after Mashape merged into Rapid API,
Do we need to do anything about the codes?
What's the "connect" for in the console?

Imgur

9.9 / 10

1,143ms

100%

N/A

Image upload error with code 500 and 503