Bad sickness

Assalaamu `alaykum waRahmatullahi Wabarakatuh

Respected Mufti Saheb

Often I get stuck in few places when reciting the Tashahhud. So I repeat the sentence or the few words where I blunder, which takes time. Now my question is: do I have to perform Sajdah-e-sahw for these mistakes? What if the same happens in the recitation of some Surah in the Salaah? (I do not repeat the whole of the Tashahhud or the Surah. Just the part where I made the mistake)

JazakumALLAH Khair