The following logged repeatedly in the amtsmdrlink log file:
[2015-10-19 08:03:01.593] Buffer Limit Reached: Flushing To Disk
[2015-10-19 08:03:01.593] C:\Program Files (x86)\Datatex\smdrlink\20151019_080301593_tcpbuffer.buffer created
[2015-10-19 08:03:01.593] BufferFileCount: 170
Solution: Restart the SMDRLink service.
If this happens often, setup a task to restart it out side office hours to clear the buffer.