Hi, If you want to check the reliability of the link then do the following :
show interface se x/y
under this it will tell you the load, reliability on the link. Check it should be 255/255 that's the 100% reliability of the link. If it is less, you migh want to check it with your SP.
Please check the load on the link as well. The drops could be due to heavy link utilozation.
HTH, Please rate if it does.
-amit singh