Recently my office encounter an issue where our ISP informed us that our router had advertised a high number of network prefix which causes the BGP session to go down (as there was a limit set for the number of prefix it can accept). That lasted for >12 hours.
However the problem was resolved automatically thereafter without any intervention at our end and the number of prefix advertised dropped back to normal.
How could such incident happen and what could be the possible causes for the surge assuming there is no misconfig of router?
Could there also be a possibility of a problem with the PE router?