Speeds OK but errors high. Over 1 ES per sec uptime.
Was it about 2.5 days since you last rebooted router? Best to measure errors rates from a hard reboot.
Only cause I can suggest is noisy line.
But what is actual performance experience? Sometimes one can look at error stats and worry unnecessarily when there is nowt wrong with actual use.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC