A 150A BMS should shutdown power to the system when this is exceeded, if it is properly designed and functioning, and monitors current.
So using a controller that can draw 200A (which is quite a bit more than 150A) will then cause it to shutdown the bike whenever it exceeds the BMS's limit.
To fix the problem, you can use the Sabvoton setup software and change it's battery current limit down to what the BMS is designed to handle.
Alternately you can replace your battery with one capable of what the new controller requires. (just changing the BMS to one that allows higher current is not recommended, since it should already be one of the right limits to protect the cells against damage that can cause a fire).
Or just don't use the throttle beyond the point it cuts out, if you don't want to change or replace anything.