iOS 14.7.1 Socket automatically close

[cxz137131304]

I encountered that after creating the socket, it was automatically closed after 5-10 seconds.

My iphone system: iOS 14.7.1; sdk version:0.6.0

first step: I create a socket and open it, it wrok well;
second step: I close the previous socket，Then I create a new socket and open it. Wait for 5-10 seconds，I receive delegate (webSocket:(SRWebSocket *)webSocket didCloseWithCode:(NSInteger)code reason:(NSString *)reason wasClean:(BOOL)wasClean), this socket close without any reason;
third step: I create a new socket again, and open it，now the new socket work well.

What the second socket wokr wrong? This BUG is inevitable.