Well I left it overnight and at about 7am today it did a re-sync, the FEC count has now fallen back after re-sync and SNRM is now about 6.4 in both directions. Saw a 5000+CRC spike and an 11 SES spike at the same moment it appeared to re-sync, not sure if this was just before (and caused) or just after the re-sync. Otherwise the errors have dropped back to more normal levels. I now sync at 63000+ kbps down instead of 64000+ kbps which I guess is not too big a drop. Now to see how it goes as hopefully things dry up.
Stuart