Why does my steering wheel vibrate?

What is your question?

I've had an alignment, tires balanced three times, shocks and suspension checked. I don't know what it could be! The vibration happens from 40mph-70mph. Sometimes I can also feel my car slightly pulling to the left or right suddenly. Both dealers said nothing Is out of the ordinary, please help! I have a 2018 Nissan Sentra SV

What makes this problem better or worse?

Driving at high speeds

How long has your 2018 Nissan Sentra had this problem?

Since I bought it in November