WTF this Turdus doing?

For the last several years we get Turdus migratorius that repeatedly bash their faces into our south facing kitchen windows. We try putting stuff on the glass to stop them but they seem to persist. I’m not sure if it’s the same individual(s) returning every year or if it’s a different one. My questions are 1. WTF this bird tryna do? 2. Why it spends so much time doing this? It’s literally from dawn to dusk. He might take a couple 15-20 min worm hunting break, but then he’s right back at it. 3. What can I do to stop this crazy Robin?