It's still bearable if only the the video cuts off during a bad connection.
ご質問ありがとうございます。
「回線が悪くて映像が途切れるだけならまだマシ」は英語で「It's still bearable if only the the video cuts off during a bad connection.」と言えます。
また、長い和文も英訳しましょう。下記の英文通りになります。
When the internet connection is bad, the video cuts off. Just when you think it's cut off completely it recovers. It's still bearable if the video cuts off but if the connection completely cuts out then we have a problem.
ご参考になれば幸いです。