Optical Heart rate Issues - delayed increase during workouts still hasn't been fixed

For a while now during workouts I get a delay of upto 10min where the heart will stay fixed on my low HR level only alternating a few segments up or down despite me being in 8 min into a running threshold set were my HR would normally be up around the 170bpm. After around 10min it will then adjust to your actual HR without any further issues. I have seen this has been an issue across multiple updates for several years. Garmin can you please get this fixed.