As-salaam Alaykum I would like to ask about stopping on the end of an ayaat or making a stop in the middle of an ayaah. When one stops on a word which has a sukoon on the second last letter, and this results in two sukoon being right next to each other...

Question
As-salaam Alaykum

I would like to ask about stopping on the end of an ayaat or making a stop in the middle of an ayaah. When one stops on a word which has a sukoon on the second last letter, and this results in two sukoon being right next to each other.

How does one properly read this, with and without the second letter and the last letter being a qalqalah letter?
Is the mouth supposed to let go of the second last letter making a slight qalqalah or is it supposed to directly to to the next letter?

Some letters, especially when there is a dhaad before laam, like fadhl, when there is raw and dhaad, like ardh and wadhrib, and when when there is a meem before raw, like amr are really hard to pronounce.

Answer
Wa alaikum assalaam wa rahmatullahi wa barakaatuh
When stopping on a word like: or one has to take care to give both saakin letters in a row their full characteristics and proper articulation point.  There should be no qalqalah, slight or full on the first of the two saakin letters, unless of course, it is one of the qalqalah letters.  Instead both letters are pronounced one after another.  It may take some practice for some combinations, but it very doable, insha' Allah. 
To listen to the two examples above, please click on the links below:
http://abouttajweed.com/wal-asr_128.mp3

http://abouttajweed.com/khusr_128.mp3

The word is a challenge because both and use different parts of the side of the tongue and has tafkheem whereas does not , but with practice one get used to pronouncing first and then without putting any kind of vowel or slight vowel on and then with tarqeeq.  With dua' and practice it will come out correctly insha' Allah.
May Allah make it easy for you and all who are striving to read the Qur'an correctly. Ameen