The same issue happened to me 2 days ago on two different pools. Particles and Cage. I lost 23k on particles and 2mil on cage. Same MO, Wallet address changed. On happyminers, it shows that someone tried to access it 2 times this morning.
What I believe is happening is some pool operator (or someone with access) from an "Unknow" pool (scam pool???) is using the username, pass and PIN that we made at that pool and is trying to see if he or she can have access to other pools. Also, I have noticed if I post (using the same username on this forum and pools), the "You have X failed login attempts!" appears on that pool, be it a new or old pool (eg. new coin comes out, I write great or whatever, in forum, create a new account, using the same forum name, on a brand new pool related to the new coin, the failed login shows up). I have talked to a pool operator who tried to help me. By following the address, in this case, Cagecoin, hundreds of transactions were made in the same day.
So:
Recap:
If you use the same password for multiple pools, they could have hacked the other pool or could even be one of the admins from other pools since they would have access to the salt key.
-Don't use the same Username
-Don't use the same Password
-Don't use the same PIN number
-Change to anonymous, if available.
-Check if your Wallet address is still the same
-Report any strange behaviour with your account to the pool operator
I hope it helps!
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That seems right now need to use new password everywhere I guess. I hope all pools can use 2 factor authentication. though pain in the ass the most secure way
to login. Its Unfortunate that it happened on this coin