A system service exception is where a bit of hardware made a request of the cpu for resources.
But the cpu could not perform the task, due to it being busy doing other things, or the service was already in use.
And resulted in a time out error being a System service exception it took to long to process the request.
Possible causes lack of memory, More than one piece of hardware using the same IRQ request for hardware, software calls to the Cpu. Basically the line is busy,could not complete the request within a set amount of time expected.
If you have multiple bit`s of hardware in the system that wish to use the same IRQ, this conflict is often the cause of a system service exception error.
The fix is to check all of the hardware...