CDR report: App is "Background", Destination is "s [ivr-1]" for a 5-hour call

That code means the call went into the first IVR, you see each IVR gets a number, your first IVR appears to me misconfigured therefore the call never gets terminated and/or is going into a loop, check the IVR settings, the tim out settings and the return setting should be set in a way that they dont keep on looping also make sure to set return after VM to “NO” if you revise the IVR settings I am sure you will find the issues.
Good Luck