Clicks with spdif audio recording

Let's go with my problem:
While recording from my spdif input to audio track in logic i can hear clicks. These clicks are more frequent as lower is the core audio buffer. I can deduce where around is the problem, but how to solve it? (I'm sure my usual buffer size settings are enough, 64 samples buffer works great with many exs instruments, large cpu load and without clicks)
I hope I'm missing something and this is not a bug. I've set the audio card clock as external. Sample rate detected 48khz. That's ok. I can monitor the input signal through the analog output. It sounds fine and polite. (So my device is working correctly)
I don't know what exactly i have to do with audio configuration in logic to record properly in this scenario. I've set the audio sample rate obviously to 48khz, i've tried several synchronization settings as external, autodetect external sync, etc. All of them (even with the standard settings) produce the same bahaviour. Tried turning off software monitoring. The same.
Can anybody help me or give some advice?
Thanks

Hi again, and thanks again. The same configuration with optical cables works fine (obviously with other devices, as if my spdif device had optical output i'd already used it). From smallest to largest buffer sizes. My spdif cables are good quality and short ones. I suspect there is something wrong in my clock/synch settings, but I don't know enough about it. I've told you that "clicks" are not the eventual clicks produced by not enough time to process the audio data. That clicks are very regular and may be 50 per second (I insist: not the 1 or 2 per second when you have very low latency settings). Are not the buffer size, I agree the problem is something related to sync, and the fact the clicks sound different at different buffer sizes simply provides information about something is happening each time a buffer is loaded/released. I thing there's one click each time a buffer is used. E.g. buffer size 2048 at 48khz produces 23 clicks per second, buffer size 32 samples produces 1500 clicks (you hear like a noise). I'm going to count those clicks, but i'm sure is that way.
Hope i'm not too boring and someone can give me the solution. Those who had tha same problem or those who worked correctly with spdif inputs. Thanks again.

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