Try to bump the Vocre a few notches up, and see who it works for you.

I found HyperPi 32M to be very "picky" on Vcore too. The setup will run stable and pass several tests (including at least 1 hour Prime-smalFFT, and SuperPi 32M) with whole 3 notches less Vcore than HyperPi 32M. Maybe this is happening only my setup, but give it a shot.