This is the explation from cisco but couldn't find any interface adjacency change , in the current enviroment.
If the TFIB scanner did not complete the first scan and the CEF scanner receives more than 60 requests to update TFIB0, then the %TFIB-7- SCANSABORTED: TFIB scan not completing messages are displayed. If the message ends with MAC string updated, such as %TFIB-7-SCANSABORTED: TFIB scan not completing. MAC string updated, then the message means that the adjacency string for an interface keeps changing. This is mostly due to a wrong setup or configuration
what I've found is when the MAC age time reset to 0 cef event trigger update ADJ. But if anyone doing proxy arp / routing to interface we could see broadcast arp request which will update the MAC timer to 0 . is it a desired behavior ?