Board Thread:Questions and Answers/@comment-31118942-20180716121127/@comment-35703536-20180718002936

Might be the heat. I came to realize that my Internet in general seems to be a lot slower during the summer months. Try keeping your router/modem as cool as posisble and do a mdoem-reset if you know how to do that. Other than that you could only try asking your provider.

In the meantime there is always KC-Mobile, assuming you got an android and not one of those damaged fruit ones.