EXACT SAME THING happened to me. Banned just from Stake Poker, with no specific explanation given by live support or anyone else I tried to contact. I've read over sections 1.3 and 1.4 multiple times, and am certain that I never violated any of Stake's terms. I tried asking them for reasons, to contact a supervisor or someone on the team in charge, and even the hands in which they believe I violated sections 1.3 and 1.4. Wasn't allowed anything.
Got the exact same message about being blocked by the Admin. I also really enjoyed Stake Poker but doesn't seem like anything will change. I hope they fix their systems because it's clearly wrongly banning multiple users who have done nothing wrong. Definitely post again if you hear about it happening to anyone else/you have any updates!