Pacific TF2 - flow sensor - reset the device?

I have been using the Pacific TF2 in a loop for just over a year. Yesterday after a reboot the pump read the right flow rate for about a minute, then shows 2 to 4 LH, if I power cycle the TF2 it works again for a minute or so then has the same issue. I drained the loop pulled the part checking for blockage did not see any, seems to spin freely the magnets, or I assume that's what they are on the impellers, in there still. even after taking apart and reassembling same issue. I looked on the thermal take site, but did not see if there was a way to reset the device back to factory using on board buttons on the front panel? or any other recommendations? its odd that it works at first then gives bad reading.