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Could be the reason, because of the account activity too?
Let's say, he used IP are got marked by stake because some shady activity or the IP has been blocked. Due the account is using that IP and he using the original IP, the original IP without VPN is getting blocked too because the account has been market with shady activity IP.
Off course, this is only my 2 cent.
I just got the answer 2 Moderator/admins in the stake forum have answered this question
from this explanation, yes, I admit that this problem came when I played the original games especially Dice
when I run out of balance and leave $1-2 in my account then I'll play it on Dice to collect wager weekly and monthly
It never shows up when I play games from third parties.
Faris:
This happens when you are trying to bypass the Rate Limit.
ROkenTratENsaV:
Doing something way too faster than allowed. For example playing Plinko and holding enter to spawn ridiculous amount of balls in short period of time.
Source:
stakecommunity