Question 2:
Is it true that there exists $c > 0$ such that for infinitely many $n$ we have $M_n > n^c$?
Beck [Be91] proved that there exists some $c > 0$ such that $\max_{n \leq N} M_n > N^c$.
[Be91] Beck, J., The modulus of polynomials with zeros on the unit circle: A problem of Erdős. Annals of Math. (1991), 609-651.
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