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@bullfrogerwytsch could you indeed share the code, I need same setup (kind of) :)
make sure to disconnect RX and TX pin when you compile, it is a common problem ;)
probably cause your motors use a little to high current for the drivers, which causes them to heat very quickly. To prevent burning them they have an auto shutdown build in. There are 3 solutions here. First and easiest (but less likely to succeed) add heatsinks or active cooling to the chips. Second solution is piggybacking 2 of the same chips on top of each other which enlarges the current they can switch. option numer 3 is install motors that draw less current.
is it a new 9v battery? if it is nog it can be that it lost some of it's capacity and doesnt provide enough to run motors and drivers at the same time
3D Printed, Ultralight, 3-axis Modular Time-Lapse Motion Control System
Uber Lighter 2.0
Helix- a Minimalist Bracelet Wrench Set