I have been on Libre for more than 4 years now with varying success. My last 4 sensors have been reading 2.5-3 mmol/l below my bg results 10min prior. I presume it's been like this for a while as my HbA1c came in around 2.5-3 above my Libreview predicted HbA1c Has anyone else experienced anything similar recently? Could it be an enzyme change in my body? Having just started NHS funding, i'd hate to have to give up using it. Thanks in advance for any advice given.