Second hurricane window broken in two months from the same unit

[Ryan Cleary]

We just installed hurricane windows in a unit we have.  These tenants are the first tenants to live with the new windows.  In March, she notified us that a window broke in her bathroom.  $200 later, we replaced the pane that broke.  When walking the property yesterday I noticed another window broken (it was not broken last week).  When I confronted the tenants they said it must have been when the windows were installed.  What do I do in this situation?

[Ryan Cleary]

Quote from @Bill B.:

The problem is you’re saying they are hurricane windows and they don’t break that easy. I can count on zero hands how many house windows I’ve broken, especially from inside. Doesn’t it seem even more unlikely it’s the tenant if a third window breaks that fast after a warning?

I don’t know anything about window installation but I do most things break relatively soon after purchase or only after a long long time. Maybe have an unrelated window company out if it happens. See if they can tell how it was broken and tell them it’s the third one. 

Thanks Bill!  
However, I also thought this but installation was around a year ago.  This tenant has only just started to become an issue in the past few weeks, she is not happy that we have the house listed even though we have n