Cut the long story I decided to rework my extension cable as I have aluminium installation on extensions in my house (house 2 years old) , after rework was done modem connected running constantly for over 14 days no any errors at all apart of 100k fec per day on downstream upstream maybe 3k. After 14 days decided to give a breath for dlm, modem disconnected for 9h from morning to late afternoon, turned back on for over 10 days, same figures, no any errors apart of FEC. Decided to cap line once capped fast patch kicks in on upstream after 3 days, for another 15 das with cap on booth upstream and downstream no luck with fastpatch for download. However I noticed that snr on U0 band go up like hell comparing to other bands so I decided to remove cap from upstream and keep it only on downstream to drop snr on U0 band, once I did that after 3 dsys fastpatch kicked in on downstream as well. Yesterday I removed cap completely and amount of errors looks sensible, just over 130 CRC, over 320 HEC, just over 100 ES. Hopefully DLM will leave me alone for now once I improved my line.