Have any changes been implemented in the past two days? There's a few things that could be done, but if you want to know what the "trigger" is, only change one at a time.
1. As some have said, you could increase the lighting with simple timers, changing bulbs etc. I still think the lighting is a bit low.
2. If your clowns are really hard on the nem, you could put a small strawberry basket around it - or something equivalent - to keep the clowns out of the anemone while it heals. Try to pick a basket that doesn't clock too much light, however, as this will cut out a little light.
Is he still sticky? Could always try target feeding some mysis or ffinely chopped fresh shrimp or silversides...