DG wrote@Doom, the abnormally high burst of FEC errors when interleaving was still enabled should have been a warning for you NOT to switch it off.
I could be wrong but I don't think it's the router. It's probably your line.
Try someone else's router. I think they should be an Ogero subscriber too for this to work.
But why the bursts are random?I called ogero 3 days ago for a test router.
I'm sure this is not normal for a line with the same stats:
Uptime: 0 days, 0:54:42
Line Attenuation (Up/Down) [dB]: 18,0 / 32,0
SN Margin (Up/Down) [dB]: 10,0 / 7,0
Error Seconds (Local/Remote): 17 / 0
FEC Errors (Up/Down): 0 / 0
CRC Errors (Up/Down): 3 / 19.552
HEC Errors (Up/Down): 0 / 1.733