In a Ghostbusters, the power supply is only supplying 48V to the motherboard and other voltages are made on the motherboard from the 48V. The pot can be accessed externally on this power supply but only adjusts the 48V so won't have any effect on the 5V :-/

Hello,

Finally, for information for other people landing in this post, I did the following:
- factory reset
- reload the 1.13 code from USB (which BTW did another factory reset at the end)

And so far, mid-game resets have completely disappeared. So it was more a software problem than hardware, hopefully.

I had bought the game a few days before so I don't know when it was upgraded to 1.13. Seller told me they had no reset problems and I trust him.
Measured the voltage to 48.1V, bumped it very slightly to 48.5 but it still resetted before the reset/reflash.
We have played 4-5 sessions since the reset, around 30-40 plays I would say, and no problem. Previously I couldn't make 2-3 plays without reset.