Sorry, can't confirm it, but I have never noticed a difference, and I have only used VG nic the last year+.
I have had hot spots with both, VG and PG, but always with 100mg, so I stopped using it and switched to 48mg and 60mg, and only VG base.
Last month I finished a 150ml bottle of 48mg VG that was less than half full, and had been in the fridge for at least 10 months......it got hidden behind some bags of catnip....and forgotten. I am vaping two mixes with it as I type, and nothing wrong with it [5mg nic juice].
My home stays at 74F all year round. When I mix, I take the nic out and let it acclimate to room temp. If I am in a hurry, I run some lukewarm water in a beaker [80F] and set the bottle in it for a few minutes. It always shakes easily.