OP sometimes it may have something to do with your location. Did you use a VPN to place bet? because most gaming providers restricts people from some locations or countries from playing their game. All you need to do is to read their terms of service and check if they is a rule you boycotted because they are lots of rules attached to gambling sites like stake that may not be noticed if a player doesn't read carefully their TOS.
Just read the post above yours and you would have an answer about VPN
Using a VPN alone is not a problem in Stake, I've been playing there for more than 2 years and I always use VPN for more privacy. If the use of VPN in Stake is breaking the rules, I should have been banned long time ago. In fact mu account is still fine and I also know many other users in Stake who use VPN.
Of course, the problem might be that the ToS rules were somehow violated. However, this is another complaint that concerns Stake.com in recent days. I think that in such a situation someone who represents Stake.com on Bitcointalk should comment on it.