Johns reply was along the lines of that routerstats can sometimes "loose its place" if there is a big shift over a short period of time.
That's an interesting comment, because during the night, Rx FEC plunged to 3 then a few minutes later re-configured itself and commenced recording accurately until the next occurrence but then didn't reconfigure itself. Also at the moment (last evening and night) the O2 TG585v7 racke up several 10,000s of FEC error in a short time. Currently it's showing 2,590,000 on an uptime of 2 days 3h 47m
Edit (added comment) :
Is this what you mean re. "Source" = <tr><td height='7' colspan='4'><img src='/images/spacer.gif' width='1' height='7' border='0' alt=''></td></tr>
<tr><td width='170'>FEC Errors (Up/Down):</td><td colspan='3'>463 / 2,598,410</td></tr> ??......if so there's also a lot of colspan= '4'. Surely this coding relates to the page layout of Routerstats ?