بسم الله الرحمن الرحيم
It is narrated in a Hadith: خير العمل ما ديم عليه It means that the best of deeds is that which is done consistently and without a gap.
Also Allah says in the Holy Quran:
مَن جَاء بِالْحَسَنَةِ فَلَهُ عَشْرُ أَمْثَالِهَا
Whoever comes with a good deed will receive ten times as much.
It is a good deed to read Surah Yaseen and great rewards have been promised on reading it; thus it would be excellent to read it daily. It is wrong to regard it as bida’h. You may read daily.
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.