We tried a different port on the 425, and then tested with a different fiber module. Same issue. We did however run a speedtest and noticed the connection was fairly spotty, so we are currently thinking the specific websites we are accessing may not be dealing with intermittent packet loss very well. That's why some sites are fine but these aren't. Strangely even though the download speed was intermittent the upload was consistently good. I think our next step may be to test all our fibre lines to see if one is defective.
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