I got banned a few months ago and I had over 875 points. I was wondering if I lost that points if I got banned.
Let me see. You do not lose AP from getting banned, no. You do, on the other hand, lose AP if you got banned from spamming, flaming, trolling and any other thing that will make the mods think it would be better to delete the posts and/or comments that was against the rules.
Besides that, some of the people you talked to might have cleaned their comments, which means a further loss of AP.