I don't know what severe flows are, but if you mean severe flaws

https://nxtforum.org/alternate-cryptocurrencies/monero-(xmr)-'no-long-term-future'-fatal-exploit-found/?PHPSESSID=avq335i2hul5sreab5ht6oo6h0

https://bitcointalk.org/index.php?topic=1473091.0

and many more, just google Monero flaws and you'll be overwhelmed by what'll come your way.