We would need to see a failed connection on the CSM's port-channel to see at what point the connection fails and multiple showtechs taken during the issue to see what, if any, error counters were incrementing. Without this kind of data, there is no way to tell what the root cause of the failures were.
Given that a reload of the module recovered the connectivity, it is likely not a hardware issue.
In the event that this was to reoccur, I would recommend the following action plan:
Get a showtech from the Supervisor
Using SPAN, start a capture on the CSM port-channel. The source interface of your monitor session would be Po<256 + csm-slot>. For example, if the CSM is in slot 4, then the source interface of your monitor session would be Po260.
Let one or more connections fail
Stop the capture
Get a second showtech from the Supervisor.
Also, as a proactive measure, I would strongly recommend an upgrade to the latest CSM 4.2(x) or 4.3(x) software as the 4.1 code is very old and there have been many bug fixes since then.4.2(13) would be a good choice, unless you need features of the 4.3(x) stream.
Also, note that the CSM is now End-of-Life, as well as the 4.1(x) software. Any bug fixes that are implemented until the End-of-Engineering support will only go into the 4.2(x) and 4.3(x) streams.
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