In your posted show command you are getting a lot of input errors which are marked as framing errors. This does not tell you a lot other than the data is being corrupted. It does at least point to which fiber of the pair is having issues.
With optical stuff this is most likely due to loss of signal strength someplace in the path. It could also be the interface in the router has issue with not being able to detect the light from the far end.
A couple of things to try.
Verify that you are only seeing errors on one side. If you see input errors on both sides you may have a design issue and be over distance.
First clean all the connection this fixes may of these type issues.
Swap the transmit and receive on both ends. If it is in the fiber path you sould see the input errors move to the other end of the connection.
If the error does not move it is probably the interface in the router.
In the end you may have to borrow or buy a light meter to measure your DB loss in the path.
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