You could have a hardware problem, but also
look at the output of interface fast 2/0 to see if you don't have
an interface hang at output or drop on input
Last input never, output 00:00:07, output hang never
Input queue: 0/75/0/0 (size/max/drops/flushes).
A speed mismatch might also be a reason so i suggest
you set the speed on both the CAT and Router interface manually to
100MB/s and full duplex.
If all fail, please swapout the FE card.