I also had a Bcoiner wallet APP and I had just withdrew 500K satoshis to it from a faucet just at the right time it became unavailable when I tried to login. The website says it is down and will be available again in March 2018 but no reachable support link. Wonder what will happen in March and will my satoshis appear even though I doubt it. I always test the wallets with itsy bitsy amounts of satoshis just to make sure..
If a website is down and you need to wait until March, you might as well consider those service as scams and your satoshis gone
What kind of website had a maintenance for two months, are they moving their server physically with cargo ships? ridiculous
Only use trusted wallet that is listed from bitcoin.org itself
https://bitcoin.org/en/choose-your-walletEdit: Just visited Bcoiner, the website itself is a joke, It looks made in free wordpress theme