is your Mame a modified version of Mame ? like fast Mame or EZ Mame?
some hacked versions of Mame have a reset in them that can be done with a few comb hits.
I would hate to have this happen to me also
weird that only the ROM reset and not Mame or PC

seems to me it has to be in Mame or the ROM.
Mame 99 is as high as I go.
have you played this game before or was this a first and your friends found a glitch for you.
I can not see this being a PC problem if only the ROM rest.
some how some one had to tell Mame to reset the ROM or a bug in that game seems the only choice to me