I have now asked the ISP to request Openreach to do DLM resetted remotely and see what happen.
Updated:
The ISP say no.
No, it's not possible to do remote DLM resets, this is the same for all Openreach based connections I'm afraid regardless of carrier.
We'll continue to monitor the line for you over the next few days.
But, I did told the ISP yes Openreach do this including G.fast see here: https://www.ispreview.co.uk/index.php/2020/10/openreach-give-uk-isps-more-control-of-broadband-dlm-profiles.html
That appears to be specifically for VDSL2.
Although Mark writes
The current DLM system is used to control the speed and stability of copper based broadband lines (ADSL, VDSL2, G.fast),
He's just lumping all technologies together because they all have a DLM.
The ADSL DLM isn't even run by OpenReach.
Providers need to pay to use that functionality, with the cost being split between all CP's who take up the option.
Your provider UnchainedISP is not a direct OpenReach customer.
They purchase from BT Wholesale or Talktalk Business and not directly from OpenReach.
If their supplier (BTw or TTB) have not taken up the option of paying for the advanced DLM controls then there's nothing they can do. I expect BTw and TTB would have taken up that option though
The briefings related to the above DLM tweaking make no mention of G.Fast. I believe they are only available for the VDSL2 DLM.
You must be a nightmare of a customer. There's no need to contact the ISP every single time your sync drops slightly.