I would have thought so, as SNR value that high, the DSLAM/Exchange may think it will would require at BT OPENREACH visit, so goes into default mode, or stays the same etc. Best to SEND ASUS a Feedback form if you are running Official Firmware, let them know about latest bug, mention UK Sentinel at beginning and I will drop them an email also asking them to keep an eye out for your feedback
I have sent feedback and mentioned your name. Will revert back to beta585 which has been most stable for me so far.
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