Modem is a standard Spark Huawei HG630b naked VDSL line ive also noticed when it drops sometimes the line speed is completely different my last drop.
Napier to Hastings speed test
http://www.speedtest.net/result/6461338604.png
Line standard VDSL2
Downstream line rate (kbit/s) 10431
Upstream line rate (kbit/s) 865
Downstream SNR (dB) 13.4
Upstream SNR (dB) 9.2
Downstream line attenuation (dB) 23.2
Upstream line attenuation (dB) 20.9
Downstream output power (dBmV) 18.7
Upstream output power (dBmV) 7.1
Downstream CRC 8
Upstream CRC 1538
Downstream FEC 148
Upstream FEC 6553