Thank you for reaching out to us on our online Answers forum. I can understand your frustration on being unable to view a clear picture while traveling. I would be glad to assist you with this issue. The problem can only be one thing. It is the download speed from your phone or tablet. When you travel like that you fall victim to fluctuating network speeds over your mobile connect. I would run a speed test when ever you get a poor picture and test your download speed.
Here are some links to check out:
I hope these help out.
The Sling Media Moderation Team