SSTP-Inteface name changes after DSL reconnect

Hi,

my sstp-interfacenames are changing from sstp-name to sstp-name1 and vice versa after 24h disconnect of my DSL. My monitoring software (check_mk) complaines about missing interfaces an i have huge gaps in RRD graphs.
Should I schedule a script to rename the interface every morning or are there any other tricks?

Best
Marc