low flow error for 10 secs at start of dialysis

So when i put the machine is dialysis mode and start running it up it will give the yellow banner low flow error for approx. 10 seconds, from that point on it will run perfectly, test good and never gives off the error again. Its a 2008T with 10,000 hours. it never alarms any any other mode, rinse, heat or acid clean. Any ideas? All pressures check out..