It is hard to know if these are an ongoing issue or were they associated with the particular interface outage. I suggest that you clear the counters, let them run for a bit and then show interface and see if these error counters are incrementing.
It would also be helpful to see the output of show controller t1. This might help confirm if there are problems on these lines.
Your post is clear that they both went down at the same time and implies that they both came back at the same time. So I would look for some commonality. They may be provisioned from different ISPs but it is very likely that they come into your facility through the same service entrance (trench/conduit or whatever).
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...