When a channel or account is suspended, there'll be an email sent with the reasons for termination. Also, have you tried appealing the suspension? Here's more info on channel terminations, including why it can happen and how to appeal: http://yt.be/help/WX8p . Hope this helps.
I went from a peak of 650K views in a day to under 6 k a day starting March 5th at 12pm they repaired it then demonetized me and hid me telling me to remove content. I did and lost almost everything and then they re-monetized me and then still hide me from suggested.I have proof