Hi

I bought my 2860n about a week ago. It replaced an Asus dsl router.

I am on BT infinity 2.

The moment I connected the 2860n for the first time it showed me 2700 upstream error seconds as well as millions of FECS.

I believe these were caused by the ASUS but I do get around 10 Upstream ES per day from the Draytek.

So how long does it take for the ES Upstream stats to reset. I've rebooted a couple of times but they just seem to accumulate even though I only have around 10 per day

Upstream ES stats will be provided by the DSLAM in the street cabinet. There is no way to get to reset afaik. Just take a note of them and compare each day. 10 ES per day isn't too bad anyway.