Python socket not reading multiple lines

Question

I have below python code snippet that acts as TCP server. The problem is when I try to send multiple lines from client one by one I am receiving only the first line and after that TCP server is sending RST(I verified this in wireshark) whereas if I send multiple lines at one shot I am receiving all of them.

class SyslogTCPHandler(socketserver.BaseRequestHandler):

    def handle(self):
        total_data = []
        while True:
            data = self.request.recv(8192).strip().decode("ascii")
            if not data:
                break
            print("LOG: {}".format(data))

def open_tcp_syslog_server():
    try:
        server = socketserver.TCPServer(('0.0.0.0', 5143), SyslogTCPHandler)
        server.serve_forever(poll_interval=1)
    except (IOError, SystemExit):
        raise
    except KeyboardInterrupt:
        logger.info ("Crtl+C Pressed. Shutting down.")

open_tcp_syslog_server()

Below is the TCP client that I am using,

If I uncheck "Send One message per Line Feed" then it works fine. One more thing to note is that if I change the encoding to "UTF8" from ASCII then its working fine.

Any idea on how what's happening?