|There is no "right" value for the memory usage of the SYSTEM process. In some contexts 99,000 KB will be completely normal. A value of 200 KB is very low and would occur only in the event of very heavy memory pressure.|
The memory usage of all processes, both user and system, is highly dynamic. The memory usage of the SYSTEM process will vary greatly depending on what the computer is doing and how much memory is available. A variation of over an order of magnitude is completely normal.
Your computer may be having problems but this is unlikely to be the cause.