Q. If during namaaz one forgets the surah in between, then what should he do?
A. If a person forgets verses of a Sura, then there is no need for him to start over the Sura. However, if he wishes to start over from the beginning in order to remember what he forgot, he can do so. Besides this, if he has read sufficient Quran already and he cannot remember the other verses of the Sura then he can go into another Sura or go straight into Ruku.
And Allah knows best.
Mufti Waseem Khan