«Простите, можете еще раз повторить, медленно?» — Is the word order too unnatural?
No, it isn't. As far as I know, this sounds very good. And it should be accepted.
Спасибо большое, Куршид!
А как можно повторить не "еще раз"? :)
"Sorry, can you repeat once again, slowly?" is not good English "Sorry, can you repeat it/that, slowly?" is correct. First off "repeat" in this context has to have an object, and second off "Repeat again" is a tautology
I used "Izvinite" instead of "prostite". Whats the diff?
«Извини́те» should be accepted too, I think. Please report it next time you get this sentence.