Well, I had the exact same thing happen with my Argentine Boa about 3 months ago...they have a reputation for being aggressive, but I've had him almost 2 years now and he has always been very sweet (I'm not his first owner though, I got him when he was about 3 feet long, he's now about 6 feet). But one day, I noticed he started striking and hitting the plexiglass front every time I walked by, and if I stopped at the cage, he would continue to strike till I moved away. I think what got him all upset is that his cage is on the floor, and I have a dog...my dog kept running back and forth in front of the cage and I think over time, it stressed him out enough to make him start striking. My solution was to put a blanket over the front of the cage when I had my dog in the room, and he's been calm ever since. I don't know your situation, but if you have any cats or dogs, this could be the cause. Just something to think about.

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