Hi, we have two units for measuring T&H - S3121 which have both failed calibration with identical problem: humidity error is increasing significantly in the higher range, so between 75-95% RH, measurements are almost 10% out. Unit passes calibration with RH around 33% - error is about 2%. With increasing humidity, error increases. One unit has shown issues after a year of usage,another after less than a year. One unit uses sintered bronze cover F4000, other one uses F5200B filter. The error in measurement is pretty much identical for both, they measure the same when sat next to each other. Temperature reads fine and passes calibration. Is this something that can be repaired or adjusted? Thanks in advance.