Nooooo. I love playing the Time Fantasy when we come down. =(

Make sure the roms are well seated and press in on the interconnect.

Does it do this all the time or only after a while it's been on

I wonder if it is rebooting constantly?

just had this going on with my jungle lord. New rom sockets fixed it.

If the 40 pin connector is original it is time to replace it. Try reseating the driverboard to the MPU and see if that resolves the problem. If it does, replace at least the driver board female connector side in the near future. Check the 5VDC to the MPU.

My Time Fantasy did something similar earlier this year, clear out of the blue while running in attract.

Since I'd previously replaced the 40-pin interconnect and usual-suspect sockets, I was baffled. Turned out, the actual main CPU chip had finally just died in that moment! I replaced it (lucky to have a spare on hand) and game went right back to normal - if I put the original CPU chip back in it went crazy. So perhaps that is worth investigating, especially if the chip was made by AMI - those are apparently infamous for such issues. The CPU chip is already socketed so assuming the socket itself is good, it's easy enough to try if you have a spare chip.

I hope you get it fixed but I gotta say that from an aesthetics standpoint this is one of the coolest-looking and coolest-sounding glitches ever.