Change link based on quality

hello all, I have a network of branches with dual internet connection from different ISPs and I have brought up two DMVPN connections one on each ISPs connection for failover now when a link from ISP1 doesn't go completely out but starts giving me about 4-15% packet loss my branch will switch back and forth from primary link to secondary link and back to primary this goes on and on until either I manual shut down ISP1s link in my router or the packet loss goes down to 0 meanwhile all my VOIP sessions are getting dropped and people complain about bad connection now I have IP SLA configured to change my route if the first ISP goes down but I need a way to both to change my default route and failover to secondary DMVPN Tunnel when ISP one start getting packet loss more than 2 percent. basically I want to change a link based on quality.
I really need your help.