Green artifacts on PI 3

HI All.

Using LibreElec 7.90.010 on PI3. I have recently started getting green artefacts around the edges of moving content on some videos.
ripped DVD/Blue-Ray seem to be fine most of the time but recorded TV (TVHeadend) in SD gets it the worst. After a short while of playing every moving edge starts to get green artefacts and it seems to suffer more with interlacing issues.

When playing fast moving recorded HD or Blu-rays I start to get the thermometer up in the top right indicating overheating.

I have the PI hardware decoding licenses installed.

Any help appreciated.

Think I've managed to alleviate the problem for now! Changed deinterlacing from auto to half Bob and it's massively better