Routers do not report a line noise figure, but a SNR Margin.
What are the full stats for the connection (connection speed, attenuation and margins) and post a link to a speed test done on https://www.thinkbroadbandcom/speedtest
Stalls like this where it seems the xDSL connection stays running is often a symptom of delays in DNS lookups, or others also using the connection e.g. mobile phone doing large upload which impacts on those trying to download at the same time.
Well sky mentioned "noise".............................!
System Up Time: 597:58:05
Port ____Status____TxPkts______RxPkts______CollisionPkts______Tx b/s____Rx b/s___Up Time
WAN____MER _____28441353___82411200 ____0_______________3010_____1080___ 231:28:24
WLAN___Up______ 48768536___26224303 ____0______________618840____14637___597:57:30
Broadband Link ____Downstream___Upstream
Connection Speed__40000 kbps_____9999 kbps
Line Attenuation____9.1 dB_________0.0 dB
Noise Margin_______21.9 dB________22.22 dB