The lines dropped together today, so assume problem at the Exchange, this is current status;

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ATU-R Info (hw: annex A, f/w: annex A/B/C)

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Running Mode : 17A State : SHOWTIME
DS Actual Rate : 21044000 bps US Actual Rate : 4629000 bps
DS Attainable Rate : 21076792 bps US Attainable Rate : 4629000 bps
DS Path Mode : Fast US Path Mode : Fast
DS Interleave Depth : 1 US Interleave Depth : 1
NE Current Attenuation : 29 dB Cur SNR Margin : 5 dB
DS actual PSD : 7. 2 dB US actual PSD : 10. 2 dB
NE CRC Count : 239 FE CRC Count : 105511
NE ES Count : 55 FE ES Count : 28547
Xdsl Reset Times : 0 Xdsl Link Times : 3
ITU Version[0] : 00000000 ITU Version[1] : 00000000
VDSL Firmware Version : 05-07-06-0D-01-07 [with Vectoring support]
Power Management Mode : DSL_G997_PMS_L0
Test Mode : DISABLE

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ATU-C Info

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Far Current Attenuation : 35 dB Far SNR Margin : 6 dB
CO ITU Version[0] : b5004244 CO ITU Version[1] : 434da48c
DSLAM CHIPSET VENDOR : < BDCM >
>

OK, thanks to AdrianH54, tried the 00 version of the 3.8.5, and thus far have ZERO CRC's on the connection. Its running about 16.7Mbps, however with a attainable of 20, hoping that will creep up.. watch this space...

Non-Vector seems to solve the problem... also fewer hiatus's when browsing etc.

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ATU-R Info (hw: annex A, f/w: annex A/B/C)

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Running Mode : 17A State : SHOWTIME
DS Actual Rate : 16684000 bps US Actual Rate : 5136000 bps
DS Attainable Rate : 20873856 bps US Attainable Rate : 5134000 bps
DS Path Mode : Fast US Path Mode : Fast
DS Interleave Depth : 0 US Interleave Depth : 0
NE Current Attenuation : 30 dB Cur SNR Margin : 4 dB
DS actual PSD : 7. 4 dB US actual PSD : 10. 1 dB
NE CRC Count : 0 FE CRC Count : 0
NE ES Count : 0 FE ES Count : 0
Xdsl Reset Times : 0 Xdsl Link Times : 1
ITU Version[0] : b5004946 ITU Version[1] : 544e0000
VDSL Firmware Version : 05-04-08-00-00-06
Power Management Mode : DSL_G997_PMS_L0
Test Mode : DISABLE

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ATU-C Info

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Far Current Attenuation : 0 dB Far SNR Margin : 6 dB
CO ITU Version[0] : b5004244 CO ITU Version[1] : 434da48c
DSLAM CHIPSET VENDOR : < BDCM >

8 1/2 hours later - NO CRC's at all.. Previously this would have been in the hundreds...

Looks like the non-Vector firmware solves the problem... Now just want the speed to nudge up a bit to the attainable rate! (Interestingly upstream shows higher actual than attainable...)

vdsl status

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ATU-R Info (hw: annex A, f/w: annex A/B/C)

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Running Mode : 17A State : SHOWTIME
DS Actual Rate : 16684000 bps US Actual Rate : 5136000 bps
DS Attainable Rate : 20873856 bps US Attainable Rate : 5134000 bps
DS Path Mode : Fast US Path Mode : Fast
DS Interleave Depth : 0 US Interleave Depth : 0
NE Current Attenuation : 30 dB Cur SNR Margin : 5 dB
DS actual PSD : 7. 4 dB US actual PSD : 10. 1 dB
NE CRC Count : 0 FE CRC Count : 0
NE ES Count : 0 FE ES Count : 0
Xdsl Reset Times : 0 Xdsl Link Times : 1
ITU Version[0] : b5004946 ITU Version[1] : 544e0000
VDSL Firmware Version : 05-04-08-00-00-06
Power Management Mode : DSL_G997_PMS_L0
Test Mode : DISABLE

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ATU-C Info

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Far Current Attenuation : 0 dB Far SNR Margin : 6 dB
CO ITU Version[0] : b5004244 CO ITU Version[1] : 434da48c
DSLAM CHIPSET VENDOR : < BDCM >

Just out of interest, why do you expect your DS speed to increase? Mine only ever decreases, it never increases. For example my DS rate is currently 3000000 but "attainable rate" is showing as 35934500. 2 years ago they were around 38 and 42 respectively. All they ever do is go down. Like you, my US rate does vary and is frequently slightly above "attainable".