Hm, check the Card's Temperature.

There is a confirmed Bug in Voodoo2 Cards, that prevent it to run correcty in some of the modern Motherboards.

Problems can vary from erraneous behaviour, black screen, freezes/crashes, Card not being detected at all, upto severe overheating.

Since there's no central place to collect empiric Data in which Motherboards the Voodoo2 runs and where not, it remains a question of luck.

Just note that running the Card in PCI Slot 1 might cause the 'pausing', as the AGP Slot next to it commonly shares an IRQ with it. That might leave the IRQ-less Voodoo2 with insufficient/erraneous Bus time to communicate (that would explain the stuttering, as modern AGP Cards literally hate sharing anything).

Other Bios PCI settings like PCI Latency, PCI 2.1 Latency compilance and PCI Prefetching might affect the Voodoo2 as well. Try working on those as well, might help
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I was lucky : My Diamond Monster II ran fine in a A7V-333 Board with an AthlonXP 2400+

Others cannot seem to get it to work at all, or have severe problems.

Just make sure you use a 3rd Party driver that is Athlon compatible when testing. My tests were done with the FastVoodoo2 Win9x V3.0 Driver.