Hi WVW
Interface Resets happens maily due to flap observed in the link connected on the interface.
You can check out for the frequency of the interface resets or the rate of increase of resets.
If its on an alarming note then you need to check the physical link up by taking a loop from your local telco.
You can also check out for other parameters like reliability and other errors to make sure that your link is on healthy condition..
regds