Regular loss of synch

TT call centre downgraded me to ADSL without my consent when the "offered a discount".
Only found out after the even and reconnected to fiber but my connection has gone from being rock solid to regularly losing synch some times between 10 - 20 times a day.

Several engineers been out - sparks and BT but still same problem.

I have noticed putting dial tone on phone does make reconnect faster.

Any advice welcomes

If nothing changed at your end points to an issue introduced with the moving around of connections probably at the cabinet. Generally if you have access to the router connection speed and attenuation/noise margin stats these will give some idea.

These are the settings and nothing looks out of the ordinary?

Upstream noise safety coefficient (dB):
17.7
Downstream noise safety coefficient (dB):
3.3
Upstream interleave depth:
0
Downstream interleave depth:
0
Line standard:
VDSL
Upstream line attenuation (dB):
38
Downstream line attenuation (dB):
17.7
Upstream output power (dBm):
2.2
Downstream output power (dBm):
11.1
Downstream interleave depth:

Without the connection speeds at the time the figures were grabbed impossible to say much

Downstream noise of 3.3dB is a bit low, as the modem should sync with a 6dB margin usually, so does indication some variation in noise levels.

Needs TalkTalk to see that issue and work to pester Openreach for a resolution, which is probably down to wiring at the street cabinet

I have been on them but their useless. The same setting is now 19.9?

Upstream noise safety coefficient (dB):
24.3
Downstream noise safety coefficient (dB):
19.9
Upstream interleave depth:
0
Downstream interleave depth:
0
Line standard:
VDSL
Upstream line attenuation (dB):
36.6
Downstream line attenuation (dB):
16.4
Upstream output power (dBm):
1.6
Downstream output power (dBm):
11

Without the connection speeds hard to say much more other than

Noise margin now suggests that a period of noise is over, and if you resync the VDSL modem you may get more speed.

How is the modem plugged in? At an extension or the master, have you tried using test socket that is part of the master socket.